MatGetVecs() and KSPGetVecs() replaced with MatCreateVecs() and KSPCreateVecs()
since they are creators not getters

Sys: drop explicit type arguments from PetscNew() and PetscNewLog()

git grep -l 'PetscNew\(Log\)\?(' -- $1 | xargs perl -pi -e '
s@PetscNew\([^,;()]+ *, *@PetscNew(@;
s@PetscNewLog\(([^,;()]+) *,[^,

Sys: drop explicit type arguments from PetscNew() and PetscNewLog()

git grep -l 'PetscNew\(Log\)\?(' -- $1 | xargs perl -pi -e '
s@PetscNew\([^,;()]+ *, *@PetscNew(@;
s@PetscNewLog\(([^,;()]+) *,[^,;()]+, *@PetscNewLog($1,@'

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refactored residuals by adding a 'residual' method to Mat