SusyNtMaker::fillEventVars: update var names and drop missing ones

Following the changes applied upstream when going from release 2.0.14 to 2.0.16.
The changes made to TruthEvent_v1.h can be seen here:
https://svnweb.cern.ch/trac/atlasoff/changeset/601390/Event/xAOD/xAODTruth/trunk/xAODTruth/versions/TruthEvent_v1.h
Some of the variables/enums have been renamed, others dropped.
Don't know whether we still need them (eventScale, alphaQCD,
alphaQED); dropping them for now.
XaodAnalysis: update call to SUSYObjDef_xAOD::GetMET

In SUSYTools-00-05-00-14 they changed the order of the GetMET arguments.
They also added a temporary protection that uses only some of the muons
for the met calculation. Just copying what they do in SUSYToolsTester.
SusyNtMaker::fillEventVars: comment out pdf vars

They are not available in the MC sample we're using. This part is also
disabled in SUSYToolsTester@05-00-14 (see `if(false)` around L707).
Because they changed a bunch of variable names in xAod::Event, I think
that these variables will reappear in the next AOD production.
fix grl path

I don't understand why this issue didn't show up earlier...
XaodAnalysis: drop properties IsMC12b, UseLeptonTrigger

They have been dropped from SUSYToolTester as well
XaodAnalysis: drop retrieve*WithAux

The same functionality is now implemented in SUSYObjDef_xAOD::Get*
Merge branch 'st-05-00-14' into xaod

Conflicts:
	Root/XaodAnalysis.cxx