Bump version to 3.1.1

Also fix the version-bumper.
Merge remote-tracking branch 'origin/master'

Conflicts:
	bin/asdf-builder
Needed to update the tag of the Debian release to line up with the git
tags and ASDF version.
Bump version to 3.1.2
Bad formatting fixed.
Tweak the support scripts.
Tweak the index.html
Resolve overly long line in debian/changelog.
Make two files different to avoid a complaint from lintian.
Corrected cmucl-impl mailing list address.
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf