This reduces the memory usage of the stitching operation, and simplifies
its interaction with other mesh changers.
The storage of separate original and non-conformal field parts is now
done within a new "conformal" boundary condition. This condition
internally stores two boundary conditions; one for the original patch
values, and one for the non-conformal part. The conformal condition
replaces the condition applied to the original patch on un-stitch when
the non-conformal boundaries are removed. The data stored in the
conformal condition is then used to restore the previous conditions
during the re-stitch process.
This conformal condition supports mapping of various types. This means
both original and non-conformal boundary data gets mapped automatically
as a result of other mesh changes such as automatic refinement.
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