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Fixes issue #107

When a clip was splitted, and the operation undone, every other operation that was relying on the new clip was screwed, as this clip was deleted each time the split operation was undone.

The last backup file is now stored in a qsettings, to restore as often as possible.

The restored file doesn't always exist... (for instance, you didn't remount your third hard drive :D)

Rstart is functionnal.

If VLMC crashes, the project can be recovered, but some functionnalities
are still lacking.

You can test it by using Tools -> crash :D

This save the project when a crash occurs.

Securing delete media by using removeMedia method that delete the media when at the end of metadata computing

Prevent an assert to trigger, and some hypothetical strange behaviour (and well, a 0 lengthed clip is useless...)

It was possible to resize a clip past its limit by playing with beginning, then adjust the end.

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