Fix validation import from ODF. [#725321]

2014-03-01  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* openoffice-read.c (odf_validation_new_single_expr): only force
	explicit sheet namees if the base address is on a different sheet
	(odf_validation_new_pair_expr): ditto
	(odf_validations_analyze): also strip parentheses