-setnumber and -setstring can now also be used to set options (automagically, when the name contains '.'). Fixes #330

coherence now removes degenerate entities (curves, surfaces & volumes). Not toroughly tested !!!

Fopen deals with non-ASCII filename paths on Windows.

- fixed MED node ordering
- polished 64 bit Cocoa Mac OS X FLTK version
- updated copyright

serialization of options)

refactored the solver code (new GmshRemote class to handle all remote
executions, including solvers)

made client startup non blocking + prepare SINFO refactoring

better pre-fill of solver fields in GUI

- fix bb computation to avoid model jumping around when adding points in z=0 plane
- pass interpol matrices as ref

Third phase of code refactoring: move callbacks where they belong
& drastically reduce namespace pollution.

There's no new functionality for now: PLEASE TEST THAT EVERYTHING
WORKS AS IT USED TO BEFORE.