PCPATCH: Fixed memory leak when type is not multiplicative.

PCPATCH: Fixed C89 compatibility (yet again).

PCPATCH: Fixed variable declaration in for-loop (C89) and coding style.

set empty mat to NULL instead

create a dummy matrix for empty patches so that MatDestroy later does not fall over

change pc_patch_multiplicative=True/False to pc_patch_local_type=multiplicative/additive

bug fix in setPatchDiscretisationInfo, we overrand the node array

hopefully the last bit of linting...

fix some braces

more indentation fixes

code style changes

get rid of print

destroy the rowis

move the numPatchDofs check so that the IS is created either way, simplifies clean up at the end

Small fixes for P1 Poisson + multiplicative

fixing a memory leak

clean up at the end

create a rectangular matrix instead

bugfix

bugfix in pcpatch PCPatchCreateMatrix_Private

towards bringing multiplicative back into patchpc...

fix partition of unity in parallel for pcpatch

PCPatch: Adding in support for forming residuals

PCPatch: Factor out solver operations

PCPatch: Include a vector argument to ComputeOperator()