Beginning of lightweight GUI support.

- Added CMake variable to enable / disable building the lightweight GUI.
- Made some elements of the menu and toolbar hidden when in lightweight mode.
- Hid some options of the Anatomy class when in lightweight mode.
Lightgui now applied to Fibers and Fibersgroup datasets, and fibers related options.
Lightgui now applied to Glyph derived datasets.

Also moved some interface objects, to have a better layout.
Lightgui now applied to IsoSurfaces and Meshes.

Also moved some interface objects, to have a better layout.
Applied lightweight to selection objects.
Made the lightweight GUI the default one.
Fixed the size of local flipping buttons on Linux.
Now using the voxel size to correctly select the fibers.
Changed caption of Descoteaux's basis button, and hid Dipy's.
Changed way string is created, to correct compilation problems on various platforms.
Another pass to fix strings not compiling on some platforms.
Hid various coloring modes for fibers.
Robustifying the RTT module.
Added gab pathc for fiber loading on a frenhc locale system.
Same fix
Corrected the flipping of fibers.
Added Map seeding option in Ui. Not functional
Now working quite well. Bug to fix: Turn OFF map Seeding crash, and check when selecting another map, the number of voxels is erroneous
Added new functionality to work on: Drawctography. Fibers now appears when drawing on anatomy in a real-time fashion
Fixed a bug that occured when Map Seeding was turned off. The number of seed per axis is now reset to its default value