Make judicious use of U+1F42B if env variable $OPAMUTF8MSGS is set.
Merge pull request #400 from dbuenzli/bactrian-log

Make judicious use of U+1F42B on darwin.
Remove a wrong assertion
Merge branch 'master' of github.com:OCamlPro/opam
Fix indentation (no semantic changes)
Tentative fix for #449

Use this as an excuse to clean-up this part of the code which has not been visited since a very long time.
Trim the universe before computing brute force heuristics.

Remark: we don't trim it before as it is useful to have a full universe to better report error messages.
Fix duplication of error messages in case of conflicts (see #474)
Add a function to keep only installable packages
In opam list, only display the installable packages.

This fixes #474
Merge branch 'master' into HEAD
Bump version
Fix #473 and #469

Now:

    opam info foo.version

will display the metadata associated to this given version
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