Removing last memory warnings on buildbot (could not reproduce them locally)

There are only a few warnings left on buildbot/memcheck.  In order to fix them, I tried to reproduce them locally.

None of the remaining warnings could be reproduced on my local SHOGUN machine (ubuntu 14.04). That's why I think it's not a problem within SHOGUN, but something related to the buildbot.  Therefore, I'm adding these suppressions to have a clean build as soon as GSoC starts.

@vigsterkr - I think you should have a look.  I'm not merging until you said that you agree. ;)