Fixed two first, save and load slots for config were swapped.
Second: saveJobs should not be called in the class destructor, but in the "done" slot, to correctly save timers on exit.

Also added a (NOT used) method to format a string as "minutes:seconds" given the integer seconds number... PROPOSAL: how about removing the QLCDDisplay and having instead a QLabel with a more human-readable text (formatted with that new method)?