- uniformize syntax for parFromPoint/XYZtoU (cf. versions in GFace)
- fix compile

Added ability to compute the "scalar potential cuts" for homology
generators using coreduction. Modified utils/misc/celldriver.cpp to
demonstrate this.

Added some more or less useful utility and experimental functions.
Numerious bug fixes.

added createTopology when Merging a MSH File and implemented discreteEdge

Modified utils/misc/celldriver.cpp example to demonstrate this.

fix tetgen from Hang

interpolation (which prevent geo transforms on extruded entities)

Squeezed #if defined(HAVE_KBIPACK) preprocessor instructions only around
those parts where kbipack is really needed. It seems some homology fun
can be done without it when using coreduction algorithm.

- display all control points in GUI for gmsh curves
- uniformize Fl_Value::step() values in GUI

method to kbipack.