patchLocal patch

[Stephen Smith]

This patch fixes the behaviour of f.patchLocal() for new field.  The existing
version was providing the wrong domain because of the way domains are
computed with different centerings.

The fixed version gives a field with the physical domain corresponding to the
cells owned by the patch and a total domain that includes the guard layers.
You can use patchLocal to write into the internal guards if necessary.

This fix was required both to wrap up work on particle interaction with new field,
and get scalar code sections of Blanca's code running in parallel.

Reviewed by Scott Haney.

Tested with KCC and --messaging on multi-processor Linux.

    Stephen

<<27.Jun.patchLocal.patch>>

27.Jun.patchLocal.patch
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