Xenial 16.04.1 Point Release RCs

[Adam Conrad]

As of right now, 16.04.1 ISOs are slowly trickling through the build
system to the tracker.  With the exception of GNOME[1], they have no
known showstopper bugs, so please pick a flavour and test thoroughly
so we can fix what needs fixing (or, better yet, find nothing to fix
at all), and release casually and calmly on Thursday.

... Adam

[1] The GNOME ISO should be fine, except that it will still include
    gnome-maps.  I need to fix that in livecd-rootfs in the morning
    and respin, but don't let that stop you from testing.