Faster rich reconstruction

Merged Christopher Rob Jones requested to merge FasterRICHLikelihoodMinimisation-2016 into 2016-patches

Backports the updates from !114 (merged)

Various speed ups.

  • Faster RICH Global PID minimisation through use of additional data caches.
  • Optimisation of the pixel background tool.
  • Change IRichPhotonReconstruction reconstructPhoton() to return a boolean instead of StatusCode

Merge request reports