L3 update

Here is the updated Muon HLT L3 reconstruction code. It contains a number of classes which have been modified that the current Cascade algorithm uses in addition to new classes. The modifications and new code can be used as part of a new algorithm which will replace the Cascade algorithm. However, the current Cascade algorithm can still be used.

Relevant presentations include: https://indico.cern.ch/event/297801 and https://indico.cern.ch/event/351559

The code has been updated for multithreading and updated with fillDescriptions() also.
the MuonCandidate doesn't appear to own the trajectory pointers.
This code has to be checked with valgrind and memory leaks fixed before integration.

See, e.g. 
" Run memory analysis with valgrind " in https://twiki.cern.ch/twiki/bin/viewauth/CMS/RecoIntegration#Local_tests_of_PRs