self hosting + nightly snapshots

[DJ Delorie]

> How is it determined whether or not to put a newlib snapshot up?

newlib snapshots are included no more than once every five days.  This
is mostly to reduce disk space needs.  As newlib doesn't change that
often, this is a calculated risk.  When it happens, we can either post
a suitable patch, or you can wait a few days for a newlib snapshot to
show up.

> Is this done automatically?

Yes.  The entire snapshot system is 100% automated and unattended.
There is *always* a risk that the snapshots won't build.  If you
expect otherwise, please change your expectations.