extrema are not (yet) implemented => use 'custom' instead, ellipses are
coming ...

new sampling options to diplay one out of N elements (post-pro) or labels (mesh; this replaces the old labelsFrequency opt)

for reporting the bug)

(useful for large datasets with number of components != 1, 3 or 6,
for which doing Plugin(Extract) would be too expensive)

better gestion of remote messages ("a la getdp")

finished up first pass at remote view management:

* interactive stuff is now almost feature-complete (including
  multi-step, axes and adaptive refinement)

* plugins can now be executed on remote views

* renamed GmshRemote->ConnectionManager & GmshDaemon->GmshRemote

also transfer vector arrays

(we should design a small container atop the va to store the additional
info we need to transfer: min/max, bbox, timeval)

moved PView vertex array computation from graphics to post-processing module
(so we can use them without opengl, e.g. on remote cluster)

NMAX should be 8 -> to test by Koen

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

- moved GUI to FlGui + added experimental QGui to test Qt

- fixed most MSVC and gcc compiler warnings

- converted some remaining tabs to whitespace (that's why the patch is
  so large; please try to remember to indent with 2 spaces and not
  tabs when you commit stuff to CVS)

- merged modified patch from Konstantinos Poulios to allow saving
  physical/partition as element tags in mesh formats that don't
  support them natively

drawing code from another widget toolkit)