merge from 3.3

Hg-commit: 72d3954e98b043f05918b6fdf6ef100e771ada23

Allow PetscCommDestroy(&comm) where comm=MPI_COMM_NULL

Hg-commit: 4ce130ffe1ec8862500c44ad76057e58318b2394

Now the inner A solve in S = C^T A^{-1} B by default is the same KSP as the (0,0) block. If you give any options with -fieldsplit_1_inner_* (or <split name>_inner_*) then it creates a new KSP with th

Now the inner A solve in S = C^T A^{-1} B by default is the same KSP as the (0,0) block. If you give any options with -fieldsplit_1_inner_* (or <split name>_inner_*) then it creates a new KSP with that prefix
- Added MatSchurComplementSetKSP()
- Added PetscOptionsFindPairPrefix_Private()

Hg-commit: 780f6f61e3b8a31069a311f5f8e3c99c14add8a8

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Fortran binding for PetscOptionsView()

Hg-commit: cbd93afde6b93626450d4e3eadd1d6ee6640788a

Removed old pthread code.

Hg-commit: adce8f56f5e22f1cc42f23405c6d3e111fb0272c

merge from 3.3

Hg-commit: 72999ae3f7e0a52ac7b15b4414333ef0ef2eda02

Activated the threadcomm code, except the vector operations.

Hg-commit: a296ebdc181b114f93d2bdc0fea1c80e43c51379

Add -malloc_log_threshold and PetscMallocSetDumpLogThreshold()

Hg-commit: f004e0725884007841f130fd6278d39edc6c6c20

added PetscCheckPointer to PetscValidPointer macros
fixed passing wrong comm to seterrq() what a waste of time tracking down Dmitry's bug

Hg-commit: 0ba7dad6944951e121539c3d28c1b69474df0172

Add const to many enum string lists

Hg-commit: c83e9a8fda58664955a3d65190eafbaf3a08ee6d

Needed to make PETSC_RUNNING_ON_VALGRIND and hence the location of valgrind.h universal so that PetscCheckPointer() could be used anywhere and not be triggered when run under valgrind

Hg-commit: c65

Needed to make PETSC_RUNNING_ON_VALGRIND and hence the location of valgrind.h universal so that PetscCheckPointer() could be used anywhere and not be triggered when run under valgrind

Hg-commit: c6539cb758dd89a4e698360f117e72536e09cddc

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added PetscCheckPointer() that uses sigaction and setjmp to check if a pointer points somewhere valid

Hg-commit: e9f69be1a6a58b4fa53793fc34fe1b574e1afc3f

backout all chmod stuff in bf971ba58125
[but keep diffs to src/mat/impls/aij/mpi/mpimatmatmult.c ]

Hg-commit: 4a812fc1f35496ce2717c7da9ef12ffabbd13258