13.1.0 development build 12 released

[Daniel Drake]

A new 13.1.0 development build is available.

http://wiki.laptop.org/go/13.1.0
http://build.laptop.org/13.1.0/os12

Changes:
- Recent XO-4 suspend/resume work and misc fixes
- yum doesn't complain about GPG keys any more (#12164)
- GNOME shuts down quickly again (#12210)
- XO-4 should reliably make all disk space available now (#12150)
- etoys usage of "gzip --rsyncable" should be fixed (#12223)
- A couple of activity updates

Build 13 might also be quietly published tonight, for XO-4 only, just
with one change: some kernel fixes aimed at helping our team who are
currently at the factory preparing the C1 prototype build.

Thanks for any testing and feedback!
Daniel