Log Message:
Update to 0.5.1:

goffice 0.5.1:

Jean:
	* Fix crash in gog_renderer_update. [#477052]
	* Copied FFT and complex numbers code from gnumeric.

Jody:
	* Some extensions for OOX charts.

Jon KÃ¥re:
	* Fix format selector crash [#475136].
	* Don't	close image save as dialog after wrong extension. [#420451]

Morten:
	* Add function to test if a format has an hour field.
	* Re-enable GTK_DISABLE_DEPRECATED
	* Fix format dialog crash.  [#480971]