Fix for bug PAL8166 : [IMP] A flag "clean memory after each frame" in visu animation :
1. now we use ProcessEvent mechanism from SALOME_Event instead of
qApp->lock() and qApp->unlock();
2. add fix for bug IPAL12899 from WP_DEV branch;
3. the following characteristics from "Animation" dialog are
available now from Post-Pro preferences too
-- Speed
-- Cycled animation
-- Use proportional timing
-- Clean memory at each frame
4. the tab order in Post-Pro preferences was changed: now it looks like
"MED import"-"Scalar Bar"-"CutLines"-"Sweep,Animation"-"Representation"-...
