- import STL solid names

- consistent treatment of errors in command line arg parsing (exit only when actually processing a command line, not in inetractive mode or when initializing the api)
- automatic listing of available mesh formats

add direct tickz (pgf) output through gl2ps + fix file dialog (incorrect activation of some options since background changes)

use .geo_unrolled as extension when saving unrolled geometries - it's too dangerous to overwrite one's work with .geo!

Implementation of a VTK interface for visualization in parallel with ParaView, with the capacity to adapt the views:
- VTK writer for GMSH GUI
- VTK static variables for GMSH external library (linked to ParaView plugin)

- ParseString can now run in the current model directory (useful when parsing things with relative filenames)
- New View.Time option to select the timestep according to the time value