--with-threadsafety no longer requires --with-debugging=0

build: 'git describe' does not always work. So use 'git log -1 --pretty=format:%H'

Also replace os.popen() usage with self.executeShellCommand()

And attempt to not abort on git errors. [print a war

build: 'git describe' does not always work. So use 'git log -1 --pretty=format:%H'

Also replace os.popen() usage with self.executeShellCommand()

And attempt to not abort on git errors. [print a warning and gather 'git status' in configure.log]

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example run used PETSC_INDEX_SIZE and PETSC_SCALAR_SIZE but these were not set by configure nor was the example listed in a test in the makefile hence was never tested

added example to test for thread safety

Contributed-by: Ed D'Azevedo <dazevedoef@ornl.gov>

added --with-threadsafety flag
other cleanup for threadsafety
removed Euclid due to bit rot

manual merge of conflict

Configure: libraryOptions has all sorts of crap in it, so pull out indexTypes.py
- Needs to depend on setCompilers since it checks for a symbol
- Change refs in all modules to indexTypes

make configure more robust to corrupted .git directory
remove configure handling of hg, svn, and cvs

Merge branch 'jed/config-env-paths'

Default system paths (like /usr) are now searched by default when
--with-$package.

* jed/config-env-paths:
config: search default paths by default
config: se

Merge branch 'jed/config-env-paths'

Default system paths (like /usr) are now searched by default when
--with-$package.

* jed/config-env-paths:
config: search default paths by default
config: set PETSC_ARCH in environment

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reorge of PETSc "utilities" config files into "options" since all of these are user setable options