Mat: use PetscLayoutCompare (results is logically collective) instead of the (local) test on the diagonal matrix sizes.

Merge branch 'barry/cleanup-external-mat-solver-packages'

Updated script for detecting visible symbols

Removed unneeded visibility of some symbols
Fixed some namespacing
Removed the use of unneeded implementation includes in the TAO code

Merge branch 'master' into barry/cleanup-external-mat-solver-packages

removed bstream code since it was not in nightly tests and broken

resume MatGetSubMatrix_SeqSBAIJ() because it cannot share routine with BAIJ due to cast

replace MatSeqBAIJSetPreallocation_SeqBAIJ with MatSeqBAIJSetPreallocation to skip this call when input mat is sbaij type

bugfix for MatGetSubMatrices_SeqSBAIJ()
Reported-by: Alejandro Cosimo <alecosimo@gmail.com>

MatNorm: fix negative logging and missing error handling

MatNorm: fix missing PetscLogFlops

Reported-by: Anishi Gupta <anishi.anishi@gmail.com>

set solvertype for inplace MatxxxFactor()

Fix null output from PCFactorGetMatSolverPackage();
Reported-by: Jose E. Roman <jroman@dsic.upv.es>

Merge branch 'hzhang/matgetsubmat_sbaij1'

a variety of corrections suggested by the clang static analyzer

Time: 1 hour

Fixes for issues found with clang static analyzer,
mostly set but unused variables

Time: 1 hour

Fixes found by clang static analyzer
mostly set but unused variables plus a couple of true bugs

rm checking of (isrow != iscol) in response to Jose's request for SLEPc; Zero some ops' to avoid invalid use of MatGetSubMatrices_SeqSBAIJ()

PetscDraw: Proper implementation of PETSC_DRAW_NULL

* Remove special casing of PETSC_DRAW_NULL in the draw interface
* Rework handling of PETSC_DRAW_NULL in Draw{Axis|LG|SP|BAR|HG}
* Some 'extern' -

PetscDraw: Proper implementation of PETSC_DRAW_NULL

* Remove special casing of PETSC_DRAW_NULL in the draw interface
* Rework handling of PETSC_DRAW_NULL in Draw{Axis|LG|SP|BAR|HG}
* Some 'extern' -> 'PETSC_INTERN' fixes
* Add missing error checking

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