VecGhost trouble

[Jed Brown]

I have some heavy use of VecGhost with MatShell (so the ghosts are
required to define MatMult).  While exercising this framework, I have
noticed some operations that do not work correctly, in particular

* MatComputeExplicitOperator uses VecCreateMPI rather than MatGetVecs

* same pattern in MatNullSpaceTest (if there are no vectors to
duplicate in the null space, i.e. just the constant)

I think these cases can just use MatGetVecs which I can use to produce
the correct vectors.  Any problems with this?  (Any reason the current
code calls VecCreateMPI directly?)

Jed

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