2011-06-29  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* doc-meta-data.ui: add value entry and warning label
	* dialog-doc-metadata.c (cb_dialog_doc_metadata_value_edited): new
	(cb_dialog_doc_metadata_add_clicked): implement
	(cb_dialog_doc_metadata_ppt_changed): new
	(dialog_doc_metadata_init_properties_page): connect callbacks
	(dialog_doc_metadata_init_widgets): handle new widgets