2007/12/21 12:20:14 mst 1.29.82.1: refactoring for XDocumentProperties import/export: draw
- xmloff/source/draw/sdxmlimp.{hxx,cxx}:
  + SdXMLDocContext_Impl virtually inherits from SvXMLImportContext
  + new class SdXMLFlatDocContext_Impl for flat file ODF;
    multiply inherits from SdXMLDocContext_Impl and SvXMLMetaDocumentContext
  + refactor SdXMLImport::CreateContext to use SvXMLMetaDocumentContext
  + replace method SetStatisticAttributes with SetStatistics
- xmloff/source/draw/sdxmlexp.cxx:
  + remove the statistics export in _ExportMeta;
    this is done in SvXMLMetaExport::Export
  + call XDocumentProperties::setDocumentStatistics in _ExportMeta