Remove code which is not used during HiForest Production

The organization of the HiForest production code meant that a lot of analysis tools were included in the same folders. The switch to git motivates separating production code from analysis code, and here I attempt to remove all code that is not involved in production.
add back RhoGetter.h, needed by HiJetMatchAnalyzer
add edwenger back, needed for mc
remove old-style BuildFiles
actually delete old buildfiles
Merge branch '53x' into 445p1

Conflicts:
	MitHig/PixelTrackletAnalyzer/src/HiGenAnalyzer.cc
	MitHig/PixelTrackletAnalyzer/src/PixelHitAnalyzer.cc
	MuTrig/HLTMuTree/test/hltmutree_cfg.py

This is a merge of the code reorganization from 53x.