Backport GSM 3G broadband feature to Sugar 0.84

[bernie]

This patch series is a backport of the basic 3G functionality from 0.88.

Tested in F11-XO1-PY for some time with actual users in the field. It works with USB Option modems such as Huawei, as long as they don't need switching from mass-storage to comm mode.

Modems can be switched permanently by sending them a Hayes sequence. Automatic switching would require backporting udev from Fedora 12 or writing custom rules to invoke usb_modeswitch. I'm working on a solution, but the GSM functionality in Sugar is usable independently of it.

Backported patches for sugar and sugar-artwork are here:

 http://people.sugarlabs.org/bernie/sugar/gsm-0.84-patches/

They should apply cleanly in numeric order to the 0.84 branch using "git am *.patch".

[bernie]

I refreshed the patches for 0.84.15, but I need some time to test them.

[bernie]

New patchset works great with 0.84.15.

I've even cleaned up the code a little, it may be good to do the same cleanup in master.

[bernie]

To solve the issue with modems which need modeswitching, I've backported usb_modeswitch from f13:

 http://repo.paraguayeduca.org/f11-xo1-py/i386/os/usb_modeswitch-1.1.2-3.fc11.i586.rpm
 http://repo.paraguayeduca.org/f11-xo1-py/i386/os/usb_modeswitch-data-20100418-2.fc11.noarch.rpm

Tested in os170py with a Huawei E1556 3G modem. (works great :-)

[bernie]

This is done, thanks everyone.