Remove unnecessary files.
Adding .vtk as a supported format for mesh sequence timesteps

Also, removing some commented code.
Properly handle sequences with varying topologies.

I just handle every case with a shallow copy, it probably even has a
better performance.
More unused files removed.
Remove double save window at application quit
Add pan icon for those who don't have a middle button
Click twice on quick acces menu hides it again
Add view close in registration workspace
Add single remove/save option to bundle list
Pan icon is now svg
Remove data categories
Disable offscreen rendering before destroying rendering window, to avoid crash
A few corrections to tensor interactor
Visibility change was not rendered for fibers
Fix crash when removing a tab in diffusion workspace.
Merge pull request #151 from fvichot/remove-data-categories

Remove data categories
Merge pull request #149 from papadop/RemoveFiles

Remove unnecessary files.
Update license disclaimer
Put back some missing comments after updated the disclaimers and remove somme useless messages during CMake configuration.
Merge pull request #152 from rdebroiz/diffusion-crash

Fix crash when removing a tab in diffusion workspace.