V3.1.0

• #329 Add Apache license 2.0
• standalone-specific:
  • standalone bin: #318 revert writing of dummy hits from #287
  • standalone bin: #325 tracking ntuple to bin file with seed based on curvilinear covariance
  • #328 Avoid frtree to be written in plots.root + other updates for standalone workflow (samples and only initialStep for BH, STD and CE builds)
• new functionality and updates in general physics algorithms
  • #320 pixelPairStep addition
  • #321 Merge hits from cleaned duplicate seeds into the remaining seed
    • a significant increase in the number of pixel hits on tracks to much closer values as CKF/CMSSW http://uaf-10.t2.ucsd.edu/~lgiannini/plots_compareDupMergeSeeds_7iters/plots_building_initialStep/hitsLayers.pdf
  • #319 Account for dead strip modules
    • this is made optional in #332
  • #324 TrackState conversions from/to GlbCurvilinear to/from CCS (mkFit internal) parameterization
    • a significant recovery in efficiency at high pt
    • #330 bugfix in TrackState conversions from/to GlbCurvilinear
  • #326 Fix charge flip for STD track building option
    • STD and CE now give very similar results again. (CE is the default building option)
  • #322 duplicate removal updated for iterations (except pixelless and tobtec)
    • the efficiencies are still better or comparable to CMSSW with lower duplicate rates and slightly lower fake rates.
    • #331 adjust dupl. cleaning for pixel pair iteration
  • #332 FPE hunt side fixes + dead modules made optional