1) Created CdmSessionDataRepository to keep track of all session data - all taxon...

1) Created CdmSessionDataRepository to keep track of all session data - all taxon changes should be made here from now on. 2) Created CdmTransactionController for more transparent starting and committing of transactions. 3) Added CdmDataSourceRepository and dialog for creating a data source. 4) Added experimental progress monitor on the status line for DeleteTaxonAction. 5) TaxEditorPlugin is now significantly cleaned up.