added PetscObjectComm() and used it to replace (((PetscObject)obj)->comm)

Hg-commit: 3da37c458124ad48ae939f4e9823e4430ee0b8be

removed a bunch of duplicate unneeded includes of std include files

Hg-commit: b6c9f3e2b0eb8b7277fe131cc83beede5d495522

removed PETSC_NULL from C and Fortran (except declaration in C for backward compatibility). Kept PETSC_NULL_xxx for Fortran
Fixed a few bugs where PETSC_NULL had been used incorrectly.

Hg-commit: 05

removed PETSC_NULL from C and Fortran (except declaration in C for backward compatibility). Kept PETSC_NULL_xxx for Fortran
Fixed a few bugs where PETSC_NULL had been used incorrectly.

Hg-commit: 054705a517d7f4388a8a084415d7478cbe95dff4

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Uncrustified src/sys/*

Hg-commit: 9f71677807bad7b55428a6cc0f5ccc5052e91805

Reformatted: "Do not put a blank line immediately before PetscFunctionReturn;"

Hg-commit: c8a41c455986e732d0ea0513d7162a54daffaece

Reformatted: "There should be a blank line before PetscFunctionBegin;"

Hg-commit: 05bda4416aaceb2dbd9d85b5720629adc88eef98

generally SETERRQXX does not belong on its own line
also fixed formatting issues in dgmres.c (ugh)

Hg-commit: e3fffdf67cd55655a36785a0abc7c197e98ca7cd

if, for, while, switch now have consistently a space prior to the opening parenthesis.

Hg-commit: cf69a5905ee4efb938b2bdd2762f87854175a6c5