- notion of partitions and interpolationScheme
- move string utils in separate file

data asap
* finer estimate of mem usage

do this, but some people actually do...)
- added some attractor examples

* more work on gmodel post-pro
* small cleanups in divide and conquer: reduce memory by removing unused
  voronoi, fix potential crashes in meshGFace, introduce basic class dealing
  with allocations to avoid messy malloc/free

fix ordering of face vertices on quad faces in revert()

fix face vertices on quad faces

introduce notion of entities in PViewData (in prepa for gmodel stuff)