Fix most C examples to return ierr on failed PetscInitialize() or PetscFinalize()

Formatting fixes for many C examples including removing extra lines
Fixed a few set but not used variables detected

Fix most C examples to return ierr on failed PetscInitialize() or PetscFinalize()

Formatting fixes for many C examples including removing extra lines
Fixed a few set but not used variables detected by the clang static analyzer

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Fix a variety of set but not used examples in the tests

Mostly ierr
Detected by the clang static analyzer

Changed the C examples to return the error code in main()

fixed a number of variable set but not used errors in the examples

detected by the clang static analyzer
mostly ierr with no CHKERRQ(ierr);

Fixed many set but not used variables in the examples detected by clang static analyzer

Mostly ierr with missing CHKERRQ() plus a few set and not used
and a few set and then reset

Also fixed format

Fixed many set but not used variables in the examples detected by clang static analyzer

Mostly ierr with missing CHKERRQ() plus a few set and not used
and a few set and then reset

Also fixed formating in a few examples that never got cleaned up
to PETSc formatting standards

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Merge remote-tracking branch 'origin/balay/fix-fortran-unused_variables'

Removed excessive use of TaoGetConvergedReason() in Tao examples

Left one example that uses it but converts the result to a string

Added two run tests for Tao that require SuperLU

This replaces th

Removed excessive use of TaoGetConvergedReason() in Tao examples

Left one example that uses it but converts the result to a string

Added two run tests for Tao that require SuperLU

This replaces the pull request 324 that left the uses of TaoGetConvergedReason()
in multiple examples

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fix unused variables in fortran examples.

TS: Fix function declarations and visibility

* Most of these fixes where spotted by GCC -Wmissing-declarations

completed removing "variable set but not used" based on output
from clang static analyzer

Time: . 1 hours

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

Time: 1 hour

Merged in litianyi/petsc-tianyi/litianyi/fix-issue-#123 (pull request #422)

Fix issue #123 (possible division by zero in GPCG)

check if gAg is not infinitesimal

Merge branch 'barry/fix-private-functions'

Merge branch 'mlange/fix-plex-multi-level-overlap'

* mlange/fix-plex-multi-level-overlap: (259 commits)
Plex: Update ex12_5 with correct level-2 overlap
DMLabel: Add missing cleanup for DMLabelG

Merge branch 'mlange/fix-plex-multi-level-overlap'

* mlange/fix-plex-multi-level-overlap: (259 commits)
Plex: Update ex12_5 with correct level-2 overlap
DMLabel: Add missing cleanup for DMLabelGather()
Plex ex12: Fixed variable initialization and some output
Plex ex11: Added error checking
Plex ex14: Now boundary label does not have cells
Plex ex1: Now boundary label does not have cells
Plex ex1: Fix for VTK format
added some debugging code, getting ready to branch
added some print statements, should be an -info...
smome cleaning up
restructured ex11 to allow for problem specific BCs
DMPlex: Update test ex12_5 with correct level-2 overlap
DMPlex: Use global processSF in DMPlexPartitionInvert
DMPlex: Add remote leaf contributions to roots in DMLabelPropagate
DMPlex: Add DMLabelGather to migrate label values from leafs to roots
DMPlex: Refactor DMLabelDistribute to separate point stratum distribution
DMPlex: Add propagation of remote point donations for multi-level overlap
DMPlex: Fix DMLabelDistribute for all-to-all migrations
Plex: make extern exactly match prototype: semantic match is not enough.
DMP4est: typo fix
...

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Merge branch 'pr417/adam_qc/fix-tao-ls-view-typo/master'

Remove superfluous information messages

Fix typos in linesearch impls:armijo, morethuente, owarmijo.

Tao Fortran stubs not properly marked with PETSC_EXTERN so would not work with multiple libraries and visibility turned on
Fixed a couple more unneccessarily visible functions

More decreasing visibility of symbols from outside libraries
Also fix a few bugs related to having multiple PETSc libraries

labeled a variety of additional internal functions as static
to prevent them from being publically available in the library

fix a typo in defining tolerances