0032125: Application Framework, OCAF - need to have adequate message if document...

0032125: Application Framework, OCAF - need to have adequate message if document cannot be saved due to unrecognized format

A list of storage statuses (PCDM_StoreStatus) is extended for PCDM_SS_UnrecognizedFormat. It is set if
- extension of a document file name is not defined (the extension doesn't correspond to any declared file formats) or
- a storage driver is not found for the document storage format.

Modifications:
CDF_StoreList.cxx: a unique exception is raised in case of the driver is not found by the document format.
PCDM_StoreStatus.hxx: a new enumeration value is added - PCDM_SS_UnrecognizedFormat.
DDocStd_ApplicationCommands.cxx: processing of a new enumeration value by the draw-command.