move catalog on disk representation to catalog/ondisk
remove old comment
SERVER-11543: remove 3/4 of the DataFileMgr::deleteRecord references in dbtests
SERVER-11543: finish remove DataFileMgr::deleteRecord from tests
              remove one public variant
              make pdfile version call new version
SERVER-11178: Collection::insertDocument should not create a new error code for dup key errors
SERVER-11178: move reindex to use IndexCatalog
SERVER-8432: clean up error handling on index build failure