Stabilisation has been added to the mapping of fields between consistent
meshes. This means that if part of the target mesh is found not to
connect with the source mesh, then its values will be set by propagating
a value from the closest part of the target mesh did successfully
connect to the source. This propagation is achieved by means of a mesh
wave.
This stabilisation applies to both cell and patch fields, and any and
all ancillary fields that may be being stored by the patch boundary
conditions. It applies to the mapping performed by both mapFieldsPar and
the run-time mapping meshToMesh topology changer.
This fixes the previous situation in mapping between consistent meshes
in which target elements which did not connect to the source would be
given an undefined value, which would cause either a floating point
error, or (worse) incorrect operation.
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