ref #6241 change @date to @since (fix)
ref #6241 change @date to @since
ref #6190 removing svn property place holder in first line of code
organizing imports
switching transaction propagation strategy from Propagation.SUPPORTS to Propagation.REQUIRED, see http://dev.e-taxonomy.eu/trac/wiki/CdmTransactions
implementing full stack from IEventBaseDao to EventBaseController