Frame export progress and movie making support#847

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NadirRoGue wants to merge 3 commits intoBlueBrain:masterfrom NadirRoGue:master

Commits on Oct 10, 2019

API support to query export frames to disk request progress
NadirRoGue
committed

Commits on Oct 17, 2019

Support to launch ffmpeg to generate a media file out of a group of frames
NadirRoGue
committed
Adding missing pythong tests. Adding support to erase frames after video is completed
NadirRoGue
committed