SimTracker/TrackerMaterialAnalysis: merge CMSSW_6_2_X_SLHC fixes into CMSSW_6_2_X
SimTracker/TrackerMaterialAnalysis: port to CMSSW 6.2.x

  - revert and reimplement 7a4840c0d5eb32e3dc68ed695e6db6ea8f39c82a
  - support multiple IOVs
  - draw per-layer plots in a subdirectory
Merge pull request #2659 from fwyzard/TrackerMaterialAnalysis_62x_v3

Simulation Fixes -- update the TrackerMaterialAnalysis package to CMSSW_6_2_X