[TASK] Bump the version number to 0.7.80.

Change-Id: I651a8426d6235c466a303314a7ecce656fc10ba4
Reviewed-on: http://review.typo3.org/32551
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>