Write index progressively in the disker
Write index progressively in the disker

reviewed by: Julien Le Goff
Closes #1483

Flumotion/flumotion,Flumotion/flumotion,Flumotion/flumotion,timvideos/flumotion,flumotion-mirror/flumotion,timvideos/flumotion,Flumotion/flumotion,flumotion-mirror/flumotion,timvideos/flumotion