FileManager: find min and max timestamps by looping over all the runheaders
instead of simply picking the first and last one.
Removed unused fTrdQt from ReducedEventWriter so that compilation with clang works again.
template_program now writes the selector in the output file.
Merge branch 'filemanager_timestamps' into dev

Signed-off-by: Bastian Beischer <beischer@physik.rwth-aachen.de>

Conflicts:
	io/FileManagerACQt.C
Fixed wrong units in TrackerExternalAlignment.h (Bug #1388)