2009-12-09  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* gutils.c (gnm_insert_meta_date): new
	* gutils.h (gnm_insert_meta_date): new
	* workbook-view.c (wbv_save_to_output): update modification time
	* workbook.c (workbook_new): update creation date