changes for SeedingLayer based LayerHitMapCache plus some fixes and additions to HitExtractorSTRP
remove commented lines
Measure the time spent outside processing the Source and the Event
 - between the end of the previous Event and the beginning of the Source
 - between the Source and the current Event
Note: this will include the time spent in per-Run and per-Lumisection modules
fix accounting of pre-Source time for the first event
fixed compillation warnings
Merge pull request #239 from civanch/fixcomp

Fixed compilation warnings.
Merge pull request #224 from fwyzard/FastTimerService-pre_post_source

FastTimerService pre/post-Source
Merge pull request #186 from cerati/seeding-layer-cache

Seeding layer cache.