Review initial work on the migration to Wheezy
Originally created by @intrigeri on #7013 (Redmine)
The (Squeeze-based) devel branch was at commit 44e4ed90b53cc1cc9c590339f40bfe3bd3b115e8 before we merged feature/wheezy (at commit dc1736d26611d35acbdb44cd9484d92e2bf47daa) into it.
So, 44e4ed90b53cc1cc9c590339f40bfe3bd3b115e8..dc1736d26611d35acbdb44cd9484d92e2bf47daa needs a review.