Plex: Replaced brute force search with grid hashing for point location

Plex: Now every Plex has a PetscGridHash

PetscGridHash: Added a simple regular point location data structure

DMLabel: Added DMLabelConvertToSection()
- This routine converts a label to a Section+IS

Merge branch 'knepley/plex-filter'

* knepley/plex-filter:
fix: nightlybuilds - move DMPlexFilter() to be after DMLabel definition
Plex: Added declaration of DMPlexFilter()
Plex ex16: Added tes

Merge branch 'knepley/plex-filter'

* knepley/plex-filter:
fix: nightlybuilds - move DMPlexFilter() to be after DMLabel definition
Plex: Added declaration of DMPlexFilter()
Plex ex16: Added test for DMPlexFilter()
Plex: Added DMPlexFilter() - This reuses DMPlexCreateSubmeshGeneric_Interpolated(), but extends it to handle subvolumes
Plex: Fixed error checking

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Doc+Plex: Fixed function name

some code still used int for PetscLogStage

change PetscLogStageGetId() to return -1 if no stage exists

Merge branch 'master' into knepley/feature-snes-deflation

* master: (239 commits)
Bib: Moved entry
revert sources to dev - reset PETSC_VERSION_RELEASE - reset changes/dev.html - enable cuda in c

Merge branch 'master' into knepley/feature-snes-deflation

* master: (239 commits)
Bib: Moved entry
revert sources to dev - reset PETSC_VERSION_RELEASE - reset changes/dev.html - enable cuda in configure
release: set v3.6 strings
doc: add PCGAMGSetReuseInterpolation() to changes file
fix: workarround static initialization issue (perhaps compiler bug) on opensolaris c/complex build
fix: ex40,ex41 errors in src/ts/examples/tutorials/ on bsd with c++/complex Perhaps this code nees a separate section when 'enorm == 0) - as pow(0,-0.33) = inf.
manual: fix format
more changes..
PCGASM/MatGetSubMatricesMPI() changes in dev.html.
changes: more updates
Add size checks for static arrays of assumed max size [-Warray-bounds]
Doc: Update to Changes
configure: default to useThreads= 0as the useThreads=1 code currently prints output in jumbled order [producing hard to read configure.log]
Delete PETSc viewer attribute if none are left on the linked list instead of putting an empty attribute
MatGetSubMatricesMPI_MPIAIJ(): guard for an empty B-matrix when delogging memory in MatSetSeqMats().
PCBDDC: fix typos in the specification of MPI operation
MPIU_SUM was used with MPIU_INT when it should only be used with MPIU_REAL or MPIU_SCALAR
fixed bad PetscPrintf() formatting in two examples
Plex: In pointwise callbacks, use embedding dimension
updates for generating Apple installations due to changes in locations of include files
...

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Merge branch 'master' into mesgarnejad/feature-plex-globaltonatural

* master: (219 commits)
revert sources to dev - reset PETSC_VERSION_RELEASE - reset changes/dev.html - enable cuda in configure

Merge branch 'master' into mesgarnejad/feature-plex-globaltonatural

* master: (219 commits)
revert sources to dev - reset PETSC_VERSION_RELEASE - reset changes/dev.html - enable cuda in configure
release: set v3.6 strings
doc: add PCGAMGSetReuseInterpolation() to changes file
fix: workarround static initialization issue (perhaps compiler bug) on opensolaris c/complex build
fix: ex40,ex41 errors in src/ts/examples/tutorials/ on bsd with c++/complex Perhaps this code nees a separate section when 'enorm == 0) - as pow(0,-0.33) = inf.
manual: fix format
more changes..
PCGASM/MatGetSubMatricesMPI() changes in dev.html.
changes: more updates
Add size checks for static arrays of assumed max size [-Warray-bounds]
Doc: Update to Changes
configure: default to useThreads= 0as the useThreads=1 code currently prints output in jumbled order [producing hard to read configure.log]
Delete PETSc viewer attribute if none are left on the linked list instead of putting an empty attribute
MatGetSubMatricesMPI_MPIAIJ(): guard for an empty B-matrix when delogging memory in MatSetSeqMats().
PCBDDC: fix typos in the specification of MPI operation
MPIU_SUM was used with MPIU_INT when it should only be used with MPIU_REAL or MPIU_SCALAR
fixed bad PetscPrintf() formatting in two examples
Plex: In pointwise callbacks, use embedding dimension
updates for generating Apple installations due to changes in locations of include files
configure: do not fail when checking MPICH version [similar to 2cadc8fc42fbad3c229d43b955581b8d29e02ad6 ]
...

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Merge branch 'master' into knepley/plex-filter

* master:
revert sources to dev - reset PETSC_VERSION_RELEASE - reset changes/dev.html - enable cuda in configure
release: set v3.6 strings
doc:

Merge branch 'master' into knepley/plex-filter

* master:
revert sources to dev - reset PETSC_VERSION_RELEASE - reset changes/dev.html - enable cuda in configure
release: set v3.6 strings
doc: add PCGAMGSetReuseInterpolation() to changes file
fix: workarround static initialization issue (perhaps compiler bug) on opensolaris c/complex build
fix: ex40,ex41 errors in src/ts/examples/tutorials/ on bsd with c++/complex Perhaps this code nees a separate section when 'enorm == 0) - as pow(0,-0.33) = inf.
manual: fix format
more changes..
PCGASM/MatGetSubMatricesMPI() changes in dev.html.
changes: more updates
Add size checks for static arrays of assumed max size [-Warray-bounds]
Doc: Update to Changes
configure: default to useThreads= 0as the useThreads=1 code currently prints output in jumbled order [producing hard to read configure.log]
Delete PETSc viewer attribute if none are left on the linked list instead of putting an empty attribute
KSPComputeExplicitOperator: use KSP_PCApplyBAorAB

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Plex ex16: Added test for DMPlexFilter()

Plex: Added DMPlexFilter()
- This reuses DMPlexCreateSubmeshGeneric_Interpolated(), but extends it to handle subvolumes

Plex: Fixed error checking

Add size checks for static arrays of assumed max size [-Warray-bounds]

Plex: In pointwise callbacks, use embedding dimension

Merge remote-tracking branch 'origin/knepley/solkx'

Plex: Create the global to natural mapping during distribution if the flag is set

Plex: Added viewing in native format using the global to natural mapping

Plex: Added global to natural ordering support
- The natural ordering is the one you have before distribution
- Added DMPlexCreateGlobalToNaturalSF()
- Added DMPlexGlobalToNaturalBegin/End()
- Added

Plex: Added global to natural ordering support
- The natural ordering is the one you have before distribution
- Added DMPlexCreateGlobalToNaturalSF()
- Added DMPlexGlobalToNaturalBegin/End()
- Added DMPlexNaturaToGloballBegin/End()

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Plex ex3: Allow testing of general interpolation
- Convergence test for coarsening still broken
- Broke tests out into better categories
- Added tests with coarsening

Plex: Fixed bug in general interpolation
- Used index instead of cell number

Plex: Now have both nested and non-nested interpolation
- Added DMPlexComputeInterpolatorNested/General()
- Removed DMPlexComputeInterpolatorFEM()

Merge branch 'knepley/feature-snes-deflation' of bitbucket.org:petsc/petsc into knepley/feature-snes-deflation

# By Patrick Farrell
# Via Patrick Farrell
* 'knepley/feature-snes-deflation' of bitbuc

Merge branch 'knepley/feature-snes-deflation' of bitbucket.org:petsc/petsc into knepley/feature-snes-deflation

# By Patrick Farrell
# Via Patrick Farrell
* 'knepley/feature-snes-deflation' of bitbucket.org:petsc/petsc:
Clean up a few compiler warnings

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Plex: Added a flag that marks a regularly refined mesh
- This is so I know to use the more efficient interpolation scheme
- Added DMPlexGet/SetRegularRefinement()