SP-1226 / BIS-677 : Data Set Size Filling Maintenance Task - add last seen file

...nDataSetSizeInOpenbisDBFromPathInfoDBMaintenanceTask.java

...penbis/dss/generic/server/EncapsulatedOpenBISService.java

...enbis/dss/generic/shared/IEncapsulatedOpenBISService.java

...aSetSizeInOpenbisDBFromPathInfoDBMaintenanceTaskTest.java

...isd/openbis/generic/server/ServiceForDataStoreServer.java

...enbis/generic/server/ServiceForDataStoreServerLogger.java

...neric/server/business/bo/datasetlister/DatasetLister.java

...eric/server/business/bo/datasetlister/IDatasetLister.java

...erver/business/bo/datasetlister/IDatasetListingQuery.java

...sd/openbis/generic/shared/IServiceForDataStoreServer.java

...openbis/generic/server/ServiceForDataStoreServerTest.java