Fix indentation
Fix #841

Pinned packages appears as <name>.pinned in all the installed/installed.roots/reinstall files
Merge branch 'master' of github.com:OCamlPro/opam
Update docs
Factor index creation from repo collections

Move index generation from OpamRepositoryCommand and OpamState into OpamRepository
Merge pull request #855 from dsheets/repos_index

Factor index creation from repo collections
Merge pull request #854 from samoht/master

more bug fixes
Update doc again