Revert "OdfGenerator::setDocumentMetaData: add support for user-defined attributes"
Revert "OdfGenerator::setDocumentMetaData: add support for user-defined attributes"

We do not want "multi-level" property names.

This reverts commit c022423371a2a2b87b404fc9c75d816450a6f9e5.

Distrotech/libodfgen,Distrotech/libodfgen,Distrotech/libodfgen