- made db_ets:get_chunk more flexible:  * allow an additional filter  * allow a fun to define what part of the db_entry to return  -> only retrieve keys in delete_chunk_ before deleting them (more memory-efficient)
- made db_ets:get_chunk more flexible:
 * allow an additional filter
 * allow a fun to define what part of the db_entry to return
 -> only retrieve keys in delete_chunk_ before deleting them (more memory-efficient)

git-svn-id: 2a8bda7383c9ade639fce354bdc7f74a859303c9@2201 71766da9-9752-0410-ab17-bfafa751c56a

Eonblast/Scalaxis,Eonblast/Scalaxis,Eonblast/Scalaxis,Eonblast/Scalaxis,Eonblast/Scalaxis,Eonblast/Scalaxis