Deprecate geometry expressions defined on cells

Geometric expressions on the form

x = triangle.x
n = triangle.n

have been deprecated in ufl dev for a while. Now these:

x = SpatialCoordinate(triangle)
n = FacetNormal(triangle)

will be deprecated from dolfin as well, with this being the future proof syntax:

x = SpatialCoordinate(mesh)
n = FacetNormal(mesh)

This is just FYI. The fix is already in dolfin next and the buildbot is green there.

I want to remove the old syntax after the 1.4 release because it causes so much trouble with the new ufl developments on domain related features (preparations for multimesh, non-affine, functions on submeshes, functions on the boundary). That will break some book example snippets but only in ways that are simple to fix. Is that ok?

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