Uddate CHANGES
Improve error message in case of checksums on 'opam init'
Update doc API
Update man pages
Fix silly regression introduced in de774165518c9c2abdeaf63a68081738fce1e774
Add a 'release' target to facilitate releases
Fix release target
Merge pull request #521 from avsm/master

make the build more robust to git failure
Merge branch 'master' of github.com:OCamlPro/opam
Update the release/upload targets