gnome-panel now uses gnome-doc-utils

[Vincent Untz <vuntz gnome org>]

Hi everybody,

With the great help of Danilo and Shaun, I migrated gnome-panel to use
gnome-doc-utils. It should now be easier to translate the help files
distributed with gnome-panel.

I don't know how to migrate the existing translations (ja de es fr it sv
ko uk zh_CN zh_TW) and help is welcome for this.

If translators want to start translating the doc, just ask Danilo since
he knows how to do it :-)

Vincent

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