Export invisible number format characters so that LO sees blanks.

2014-03-10  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* openoffice-read.c (oo_date_text_end_append): delete
	(odf_date_text_start): new
	(oo_date_text_append): new
	(oo_date_text_end): use oo_date_text_append
	(odf_number_invisible_text): remove corresponding blank