EDIT

fix test schema for cloning

change some names in molecular and update the update script

merge trunk to cdm-3.3 branch

use strings for recordBasis (#2615 und #3544)

use strings for rankClass (#2615 und #3544)

use strings for sourcetypes (#2615 und #3544)

use strings for termtypes (#2615 und #3544)

Remove media from SpecimenOrOBseravationBase #3597

devided TimePeriod and TimePeriodParser #3617

fix failing tests for adding descriptionElementBase.timeperiod #3312 and clean up TimePeriod class