[arch-dev-public] move hddtemp to extra

I'd like to move hddtemp from community to extra. It's of quiet high usage according to http://www.archlinux.de/?page=PackageStatistics and I'd like to use it for Xfce4-sensors-plugin to be able to show hdd temps in the panel. I have some small improvements for both packages done locally and they work well together here showing two hard drives in the panel. Any objections? -Andy