replace old impl of MatFDColoring routines with new ones.

Use MatEntry struct for MatFDColoring routines for seqaij and seqbaij matrices

when htype=wp, dx is a constant scalar, thus does not need vscale

use struct MatEntry such that (row,col,valaddr) are stored contigously for efficient accessing

small cleanup of MatFDColoringCreate_MPIAIJ_new()

small cleanup

implement MatFDColoringCreate_MPIAIJ_new()

optimize MatFDColoringApply_SeqBAIJ() by inserting block column values to J

fix memory leak

cleanup MatFDColoringCrete and MatFDColoringApply for SeqAIJ

experimenting different ways of storing row, col and den2sp -- rowcolden2sp3 gives the best performance

mv redundant valications in MatFDColoringApply_xxx()

mv checking !mat->assembled from MatFDColoringCreate_xxx() to interface MatFDColoringCreate

new impl of MatFDColoringxxx_SeqAIJ works now :-)

optimize MatSetValues in fdcoloring using an array of spidx - see MatTransposeColoringCreate_SeqAIJ()
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Merge branch 'barry/improve-memory-logging'

Conflicts:
src/ksp/pc/impls/redundant/redundant.c
src/mat/interface/matnull.c

logging memory now credits to all ancestors

Use classname in object for object name when calling PetscObjectPrintClassNamePrefixType() instead of some string with less precise name passed in

fixed bug where XXXViewFromOptions() used prefix of object rather than appropriate prefix of KSP or SNES

fixed function names with Default to match new standard (which I just wrote)
fixed a few more functions that should be PETSC_INTERN

Hg-commit: 87889fe4f6d4e8d0963adcc79d438e75330601c6

Change all PETSC_EXTERN_C to PETSC_EXTERN

Hg-commit: 8d2ebbb193fb583bccc64015e35640c4e08c3426

finished all EXTERN_C_BEGIN/END fixes up through Mat including all fortran interface files

Hg-commit: a763120ba50023930be975663a3f80c58e415743