Merge branch 'master' into psanan/pc-telescope-nearnullspace

PCBDDC: fix memory leak from nightlytests.

PCBDDCGraphResetCSR belongs to PCBDDCGraphReset

PCBDDC: fix previous commit for nvecs > 1

PCBDDC: added PCBDDCCreateNullSpace

this is nothing fancy, except that it first creates an orthonormal NullSpaceObject

PCBDDC: fix computation of interior dofs at next level

PCBDDC: added PCBDDCGraphRestoreCandidateIS

now get candidates have USE_POINTER for the faces and edges

PCBDDC: another fix from nightly builds

PCBDDC: fix from nightly tests where there are no partitioner availables

PCBDDC: fix from nightlybuilds

PCBDDC: prepare code to Nedelec support

PCBDDC: fix from nightlybuilds

Merge branch 'master' into mark/snes-ex56

* master: (93 commits)
Web: Added a tutorial
typo
rename X -> U
sowing: update to version that creates manpage URLs for 'enum' types/values
Increa

Merge branch 'master' into mark/snes-ex56

* master: (93 commits)
Web: Added a tutorial
typo
rename X -> U
sowing: update to version that creates manpage URLs for 'enum' types/values
Increase patchlevel to 3.7.3
move runex3_3 to NOTSINGLE [ partial backport 9ed0bd76d5c329eb91401ebabfbd851446214e20 ]
DMPlex: local coordinate vector should be a sequential vector
DM: Name coordinate vectors in subdomain and restrict hooks
tests: disable a couple of TS examples from single precision tests
reduce TS ex12_2 output
fix PetscFormatRealArray() to cast PetscReal in print statement to double so works for __float128 precision
Vec: enable Fortran interfaces for VecGetLocalVectorRead and VecRestoreLocalVectorRead
Bib: Added refs
PCShell: man page fixes
update handling of latex in example code to use https
fix typo in isltog comment
test: Avoid conversion of object <-> function pointer type [-Wpedantic]
fortran: enable interface for VecGetLocalVector(), VecRestoreLocalVector()
update citation for cmz2016
PCBDDC: silent compilation warnings from nightlybuilds
...

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PCBDDC: Added transpose flag to PCBDDCSetDivergenceMat

fixed a bug when BDDC is used outside of a KSP with dirichlet_trick enabled

PCBDDC: comply with coding standards

Merge branch 'master' into stefano_zampini/feature-pcbddc-saddlepoint

Conflicts:
src/docs/website/documentation/changes/dev.html
src/ksp/ksp/examples/tutorials/ex59.c
src/ksp/pc/impls/bddc/bddc.c

Merge branch 'master' into stefano_zampini/feature-pcbddc-saddlepoint

Conflicts:
src/docs/website/documentation/changes/dev.html
src/ksp/ksp/examples/tutorials/ex59.c
src/ksp/pc/impls/bddc/bddc.c
src/ksp/pc/impls/bddc/bddcfetidp.c
src/ksp/pc/impls/bddc/bddcprivate.c
src/ksp/pc/impls/bddc/bddcschurs.c
src/mat/impls/is/matis.c
src/mat/impls/is/matis.h

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Merge branch 'stefano_zampini/fix-matis'

Conflicts:
src/mat/examples/tests/makefile

Move PCBDDCSubsetNumbering to ISRenumber

This function is needed by MatGetLocalSubMatrix_IS

PCBDDC: use IS instead of ISLocalToGlobalMapping

PCBDDC: Added API for passing the matrix representation of the divergence operator

PCBDDC: fixes for sequential runs and zero coarse size

PCBDDC: propagate divudotp to coarser levels

Tested with mixed boundary conditions with 3 additional levels

PCBDDC: add internal API to compute no-net-flux condition

Merge branch 'stefano_zampini/feature-pcbddc-saddlepoint' of https://bitbucket.org/petsc/petsc into stefano_zampini/feature-pcbddc-saddlepoint

PCBDDC: bugfix

PCBDDC: no need to create field split with a single field