ADD: test for DateRangeFilter.
FIX: TimestamBoundaries are now correct when selectin the same day as from and to value
Merge branch 'develop' of gitlab.pluspunkthosting.de:pt/pt_extlist into develop

* 'develop' of gitlab.pluspunkthosting.de:pt/pt_extlist:
  FIX: tests, warnings, ...
  CHG: typo3 version