(plot_moves): Don't plot the identity (reduces clutter and gets rid of plot warnings)
(FunctionalDirectedMove.__repr__): Print more detail.
Remove solved FIXME
(DirectedMoveCompositionCompletion): Plotting improvements
Makefile for "make check"
(Face.functional_directed_move): Intersect both domain and codomain with given intervals.

This makes the moves diagram of lift_of_minimal_has_uncovered_interval() symmetric.
Fix whitespace