53 x slc6 dev

Hopefully I mixed Tom's and Mauro's pulls. (Please check).

I fixed several of the issues with the missing content in the jets. The Btagging part is now complete.

However, I think there is something wrong with the ak5PFchsJets. The resolution wrt to genJets is markedly worse than the resolution of the ak5PFJets (checked on TTBar events). Is the recipe correct for sure? Are we missing any step? 

Note that the BTAG pog computes the BTAG scale factors on chs jets (see here [1]). So this will eventually affect everybody, it is important to be sure we save them correctly.

[1]  https://hypernews.cern.ch/HyperNews/CMS/get/btag/1063/1/2/1.html