2013-05-15  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* src/sheet.c (sheet_get_extent): add argument to indicate whether
	to include hidden cells
	(cb_sheet_get_extent): handle hidden cells setting
	(sheet_get_printarea): do not include hidden cells
	* src/sheet.h (sheet_get_extent): add argument and change all
	callers