[sigc] branch for libsigc++ 2.2

[Murray Cumming <murrayc murrayc com>]

I'm going to branch libsigc++ in cvs.

The HEAD branch will be for libsigc++ 2.2, which will have minor API
additions but which will be API/ABI compatible with libsigc++ 2. The
library name, header location, and .pc file will remain the same. This
will not be parallel installable with libsigc++ 2.0 and won't need to
be. If there are enough useful API additions, then we might even release
a tarball of this.

The libsigc-2.0 branch will be for continued maintenance of libsigc++
2.0 releases.

Any objections?

-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com