0.5.0

CHANGES:

• Remove opam-0install (the project has been split off from opam-0install-cudf)

• Avoid global mutable state. This allows the solver to be potentially called multiple times without causing differences in output. (@kit-ty-kate #4)

• Add support for the avoid-version flag. This is enabled by default and can be disabled by setting the new ?handle_avoid_version parameter to false. (@kit-ty-kate #2 #3)

• Add a new ?prefer_installed parameter to encourage keeping installed packages if possible. (@kit-ty-kate #3)

• Add some tests (@kit-ty-kate #2 #3)