build_event_win_kronos.C does ONLY event builder, mcbm_build_and_reco_kronos.C does event builder + reco

Apply code formatting to all source/header files and root macros.

* in standard event builder, fill the histo for time difference between digis
* in Time Window event builder algo, improves the SetReferenceDetector method (safer and more verbose)
* in both event builders, add possibility to set a maximum nb of digi cut per detector + small optimizations in trigger check
* in time window event builder, remove the setters for individual min digi nb and keep only the generic one
* in standard event builder, add doxygen description to max digi nb members and to Trigger condition setters
* in time window event builder, add a new internal method to make trigger check more generic

This version is an exact copy of the last revision of the trunk branch
of the old SVN repository of CbmRoor at
https://subversion.gsi.de/cbmsoft/cbmroot/trunk
The old SVN repository will still be available for read access.