Fix ODF roundtrip of conditional formats. [#726201]

2014-03-14  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* openoffice-read.c (odf_style_load_two_values): do not force
	explicit sheet references
	(odf_style_load_one_value): ditto
	(odf_style_add_condition): remove extra parentheses and trust
	gnm_style_cond_canonicalize