GLMixer Code

Added action 'show file in browser' for property browsers refering to a
file.

PATCH to improve compatibility of new VideoFile implementation
- convert old marking to new marks (INCREASED file version)
- fix display of time functions

IMPORTANT REIMPLEMENTATION of VideoFile
- Management of time with a Clock object, all in video time base
(double)
- management of parsing states to avoid seeking problems
- communication between threads using actions information within the
packets or the frames
THIS WAY :
- actions (seek or stop) happen on the frame (not delayed by queue size)
- seeking is not causing problem between frames
- displayed time is exact

videofile cosmetics

Bug fix video file (bad fps computation with new libavcodec)

Improvement: fasten the display of allowed sessions in the session
switcher when start to record (avoid reload of all folder files)

Bug fix file dialog (file remaining open)

Edited wiki page GLMixer through web user interface.

Edited wiki page GLMixer through web user interface.

Edited wiki page Downloads through web user interface.