Tags for MET have been updated

The tags have been updated following recommendations from [1].
[1] https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideMETRecipe53X#CMSSW_5_3_11
Documentation for the main configuration has been improved a bit
Documentation for multicrab fix when using pycfg_params has been improved

Checked that the old bug has not been corrected till the date. Added few documentation links to hypernews.
Revision numbers added to links to TWiki pages with references for recommended tags
Jet probability calibration has been prevented from running with real data
Jet pile-up ID has been added

Recipe is given in [1]. I added both evaluation of working points and values of discriminators themselves. Information on all the three discriminators is stored. After validation, it would be better to stay with evaluation of working points only for just a single discriminator.
[1] https://twiki.cern.ch/twiki/bin/viewauth/CMS/PileupJetID
Bugs in pile-up jet ID have been corrected

Previous commit was done before compilation of the subpackage, and the bugs were not spotted. Note that too many adjustments have been made by hand without any official recommendations. The pile-up jet ID tool should not be used in a physics analysis before comments from experts are available.
Secondary vertex mass is now saved

Corresponding branch had been commented out accidentally in the past; now it has been reintroduced. Documentation for secondary vertex mass has been improved a bit.