The project auto-backup feature implemented by Luis creates foo~.xptv files littering my hard drive. As I don't really like having everything duplicated, I propose the following:

- Run sanity checks when pitivi exits normally, and if everything passes, delete the backup file (or if that is not possible, maybe keep it hidden somewhere)

- If pitivi crashed or couldn't run those tests normally, the next time you try to load that project it will notice that there is a backup file laying around. If that backup file has a modification time that is newer than the original, run sanity tests on the backup file and ask the user:

_________________________________________________
[    Restore previous session?                x ]
|===============================================|
|                                               |
|   An error occured the last time you          |
|   used this project. Would you like to        |
|   load the auto-saved version instead?        |
|                                               |
|    [[ Restore the auto-save ]]  [ No thanks ] |
|_______________________________________________|