Track geom

various optimization in Local and global tracking.

Major improvements are in TrackingTools/TrajectoryFiltering and in the usual Topologies.

Cleanup and refactoring in DetLayers.

A new constructor added to TSOS to avoid recomputing magnetic field during update in place: should be done even cleaner.

Improvements in the standard (not grouped) TrajectoryBuilder used in HLT and by electron,muon and conversion.
see jira report https://its.cern.ch/jira/browse/CMSHLT-44
at the moment a version that avoids major overhead in OutIn conversion is used.

Minor regressions (expected) observed for real data high pileup