Unify

This MR comes with a few commits. Here are the status of each commits from the oldest to the newest:

• 70793a20: kept
• 441389ec: adapted: copyrights years updated
• b2a6a5a8: discarded: only applied to wheezy freeze
• c359bd68: discarded: only applied to wheezy freeze
• 3c1f3894: discarded: DUMP agreement was not included in live
• 7812c4d0: kept, no changes
• 4d7e3e16 to 2c52c5a0: discarded: already in live
• be5402ab: adapted: master and live are meant to be merged
• 2b2b702c: discarded: live is correct
• 981c3c40: adapted: copyrights years updated, mentors version taken from tags
• c415055d: kept

I also removed tabs indentation (I'm not sure how they came to be...)

This MR relates to #5 (closed)