[ANNOUNCE] GIT 1.6.1-rc1

As promised, 1.6.1-rc1 is found at the usual places, and from here on we
will be in bugfixes-only mode until 1.6.1 final.  I also think there
probably are a few more patches on 'next' (e.g. the first patch on the
gp/gitweb-feature topic, which is a pure bugfix) that haven't merged to
'master' but should.