Ok, so STLs in OCC are still somewhat unstable... Let's default to 0 and enable Geometry.OCCBoundsUseStl when necessary.

This is (unfortunately) much more accurate: even in simple cases
the bboxes of OCC shapes are otherwise not tight

Add tutorial descriptions

See merge request !313

Spanningtreev2

See merge request !312

Plugin(SpanningTree): don't use c++11 regexp to keep backward compatibility with c++98, this comes however at the cost of a poorer parsing and less flexible lists

Improve Plugin(SpanningTree): now parses list of physical + handles curves, surfaces and volumes in an ordered way (replaces the StartOn mecanism)

Fixing non-deterministic behavior in 3D Delaunay algorithm by defining the...

See merge request !310