Add new functions "isTopCell" and "cmplxDelVsInt". The latter is used to
"punch holes" in a complex; it is thus useful to deleting "forbidden
regions" in particular.
Rewrite PTrace module. Can now translate directed process trace problems into
finite directed cubical complexes. Swiss flag placed into test file as
example. Add function "cmplxVertOp" which allows us to translate all vertices
in a complex by an arbitrary vertex operation. Application was to force all
coordinates to be nonzero; this is a nice default for input to the other
algos.
Tweak documentation for DPTrace and update cabal file