Make IntervalMapVector's count() method const.
Make IntervalMapVector's count() method const.

seec-team/seec,seec-team/seec,mheinsen/seec,mheinsen/seec,seec-team/seec,mheinsen/seec,seec-team/seec,seec-team/seec,mheinsen/seec,mheinsen/seec