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Added plugin for visualizing discretization error (co-written by Thomas Bolemann from the IAG at Stuttgart university and I).

is then available to the plugin) -- for Koen

(useful for simulating synthetic foam-like materials)

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- work on plugin user-friendliness (short help & co)

in a force field (should be generalized e.g. for Lorentz force,
but that a TODO ;-)

new Tetrahedralize plugin

Encapsulate toolkit-dependent global drawing functions in new
drawContextGlobal class, and add a static drawContextGlobal to
drawContext, with a default version that does nothing.

This allows to have a completely virtualized drawing system: we can
now ship a library with a fully working graphic system, indepedent of
the widget toolkit. A client code just needs to subclass
drawContextGlobal to get working graphics (see
e.g. api_demos/mainAntTweakBar.cpp)

re-committing work from last two days after server crash:

- refactored old Geo code (new/delete)
- moved DrawPlugin to Plugin
- move from matheval to mathex
- move from Flu_Tree_Browser to Fl_Tree
- fixed crash in Triangulate plugin

- replaced old 2nd order views with new adaptive stuff (still missing
  some function spaces for quads/hexas)

Added "#if defined(HAVE_KBIPACK)" preprocessor directives to only enable
homology plugin & compile the code when kbipack & gmp library is avaible.