merged PetscViewerGetSingleton() and PetscViewerGetSubcomm() into PetscViewerGetSubViewer()

Does not currently work, needs fixes to work correctly recursively

Fix for MatLoad_MPIDense() from sparsely stored matrix
also fix for MatLoad_MPIDense_DenseInFile() when matrix has not had its local sizes preset by user

Reported-by: Jose E. Roman <jroman@dsic.upv

Fix for MatLoad_MPIDense() from sparsely stored matrix
also fix for MatLoad_MPIDense_DenseInFile() when matrix has not had its local sizes preset by user

Reported-by: Jose E. Roman <jroman@dsic.upv.es>

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Fix error in parallel loading of dense format matrix

Reported-by: Jose E. Roman <jroman@dsic.upv.es>

Merge branch 'barry/fix-matload-mpidense-denseinfile'

Merge branch 'jose/mpidense-with-array'

should be max of all processors not sum

updated PETSc directory layout to match standard packaging strategies

include/petsc finclude,private,mpiuni
lib/petsc conf
bin/petsc*

Buffer space used for loading dense matrix from file was too small when first process didn't have largest part of the matrix
also simplified the MatLoad_MPIDense() code slightly

Mat: in MPIdense matrices avoid having to assemble in case of user-provided array

Merge branch 'barry/optimize-matshift'

Cannot assume that MatSetUp() has been called on dense matrix which has been passed
into MatLoad()

Optimized MatShift() for a completely empty matrix since this is commonly used with SLEPc to produce diagonal matrices

Reported-by: Jose Roman <jroman@dsic.upv.es>

MatLoad_MPIDense() always allocated array space even if it was previously provided

Contributed-by: Alejandro Lamas <alejandro.lamas@dsic.upv.es>

MatLoad_ and VecLoad_ routines that use options database information from the binary file .info files need to PetscViewerSetUp() before accessing the options database because the "lazy" setup of bina

MatLoad_ and VecLoad_ routines that use options database information from the binary file .info files need to PetscViewerSetUp() before accessing the options database because the "lazy" setup of binary viewers defered the opening of the files until binary reading was first done which was after the calls to determine matrix and vector block sizes.

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MatAssembly: move check for InsertMode consistency into MatStashScatter impls

The BTS implementation now encodes InsertMode in-band to avoid another
set of messages for MAT_SUBSET_OFF_PROC_ENTRIES.

MatAssembly: move check for InsertMode consistency into MatStashScatter impls

The BTS implementation now encodes InsertMode in-band to avoid another
set of messages for MAT_SUBSET_OFF_PROC_ENTRIES. It does the reduction
in debug mode for better error reporting.

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PetscViewerBinaryGetDescriptor() is now a collective and must be treated as such
fixed some calls to PetscViewerBinarySetUseMPIIO()
removed some test runs that take too long