PCBDDC: fix warnings from nightly builds

PCBDDC/KSPFETIDP: fix for zero local size

PCBDDC/KSPFETIDP: added support for deluxe scaling with non-redundant multipliers

PCBDDC/KSPFETIDP: prevent from propagating a PCSHELL

KSPFETIDP: move check for FETI-DP to FETI-DP class

PCBDDC/KSPFETIDP: Fix for empty partition

KSPFETIDP: call SetFromOptions at thr right place

FETIDP: add option switch for discrete harmonic Dirichlet solver

FETIDP: added PCView to the FETI-DP preconditioner

PCBDDC/KSPFETIDP: added API for pressure solver customization

added support for Stokes with "flipped" rhs
make saddlepoint a member of the fetidp class

KSPFETIDP: added default identity for pressure preconditioner

With uniform grids, the default pressure preconditioner for Stokes can be obtained as

-fetidp_pmass_ksp_type richardson -fetidp_pmass_k

KSPFETIDP: added default identity for pressure preconditioner

With uniform grids, the default pressure preconditioner for Stokes can be obtained as

-fetidp_pmass_ksp_type richardson -fetidp_pmass_ksp_richardson_scale xx -fetidp_pmass_pc_type none -fetidp_pmass_ksp_max_it 1

with xx = h^-3 (see eq. 6.6 Xuemin's paper)

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PCBDDC/KSPFETIDP: eliminate essential dofs from multipliers

PCBDDC/KSPFETIDP: added code for interface pressure preconditioning

PCBDDC/KSPFETIDP: move extraction of off-diagonal saddle point matrices during PCISSetUp

This allows to use the change of basis in the inner BDDC

PCBDDC/KSPFETIDP: don't restrict to alldofs\setminus interfacepressure

just zero rows and columns of Amat relative to interface pressure
fix a couple of bugs with Pre/PostSolve flags

It works with

PCBDDC/KSPFETIDP: don't restrict to alldofs\setminus interfacepressure

just zero rows and columns of Amat relative to interface pressure
fix a couple of bugs with Pre/PostSolve flags

It works with incompressible Stokes with Taylor-Hood; there are still problems when using the change of basis

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PCBDDC: added a couple of tests for the scatters of the interface pressure

PCBDDC: fix additional scatters for saddle point FETIDP

KSPFETIDP: add construction of relevant objects for saddlepoint problems in SetupFETIDPMatContext

Merge branch 'master' into barry/fix-successful-numerical-factorization-after-failure/master

The maint patch for the given problem cannot merge cleanly into next due to changes
in the same code in m

Merge branch 'master' into barry/fix-successful-numerical-factorization-after-failure/master

The maint patch for the given problem cannot merge cleanly into next due to changes
in the same code in master (the introduction of MatFactorGetError()) therefor need
to merge in master and use the new construct before merging to next

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

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
...

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.

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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: fixes for sequential runs and zero coarse size