It looks like it will be easy to fix the problem that we have with
vector assignment in parallel. The solution is
1. Permit assignment via operator= of equal-length vectors only. It
will just copy values. I've tested this equal-length restriction, and
it doesn't affect any DOLFIN tests or demos.
2. If a user attempts to perform assignment of vectors that have
different lengths, print an error that recommend using the copy
constructor, e.g.
y = Vector(x)
This change will also improve performance, since at present we always
destroy and re-create PETSc vectors when assigning, even when the
lengths are equal.
Any objections to this going into the 1.0 branch?
Garth
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