Move ufc swig wrappers to dolfin

[Martin Sandve Alnæs]

After factory functions have been introduced (on the way from Johannes), we should move the ufc.i related stuff to dolfin. We still need to keep ufc.h in ffc. This is a step towards this:

https://bitbucket.org/fenics-project/ffc/issues/92/steps-to-introduce-optimized-swig-free

[Martin Sandve Alnæs]

This may not be necessary, I believe we got rid of all calls to ufc from python. If access to form or element is needed, using dolfin Form, FiniteElement, DofMap is the better way for users. So the ufc.i module can probably be just deleted soon.

[Prof Garth Wells]

Removing milestone: 1.7 (automated comment)