Changelog:
- new plugin "Global Registration" based on OpenGR library
- option to reverse wheel direction
- snap package allows to associate file extensions and to open files on external disks
- u3d exporter is now more stable and works on every platform
- removed support for XML plugins and QtScript dependecy
- VisualSFM (and some other formats) output *.nvm, *.rd.out projects supported by meshlabserver
- various bugfixes