Improve chart roundtrip through ODF. [#728197]

2014-04-18  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* openoffice-read.c (oo_parse_spec_distance): new
	(oo_parse_distance): use oo_parse_spec_distance
	(od_style_prop_chart): read fo:border
	(oo_chart): use fo:border
	* openoffice-write.c (odf_write_gog_style_graphic): add argument
	and change all callers
	(odf_get_border_info): new (partial implementation)
	(odf_write_plot): write graphic properties for the chart style