Handle table:filter-or and table:filter-and elements in ODF import

2014-03-02  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* openoffice-read.c (odf_filter_or): new, warn when we encounter
	this element
	(opendoc_content_dtd): handle table:filter-or and table:filter-and
	elements
	(opendoc_content_preparse_dtd): ditto