Improve GOFormat export to ods.

2014-03-24 Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* goffice/utils/go-format.c (go_format_output_number_element_to_odf):
	add arguments, change all callers and output gnm:min-integer-chars
	(go_format_output_number_to_odf): handle the difference between ? and #