Update gnome-icon-theme to 3.10.0

The main motivation is that index.theme now mentions "scalable"
directories, so symbolic icons have a chance of being found.

The licence has changed from GPL2 to CCBYSA3 and LGPL3.

Many icons were added, and a few have been removed:
- logviewer.png which is distributed by gnome-utils
- battery-charging.png which now has a variety of charging states
and some which can be replaced by more generic icons:
- palm-pilot-sync.png -> emblem-synchronizing.png
- palm-pilot.png      -> pda.png
- visor.png          -> pda.png

(prlw1)