Warn the user when resorting to the internal solver heuristics.
Merge pull request #1213 from rdicosmo/handle-external-solver-failures

Warn the user when resorting to the internal solver heuristics.
Add dose patch for clean exit on solver errors

Source: https://gforge.inria.fr/plugins/scmgit/cgi-bin/gitweb.cgi?p=dose/dose.git;a=commit;h=3d9b403766e7741e84fb648dde7867dd6f869b38
Closes #1202
Fixed an issue that could happen in some cases of `opam switch import`
Add support for 'package flags' in opam files
Experimental support for 'build-dep' packages
Add a lightweight ocamlfind-install wrapper to generate .install files
Rename '--show' to '--show-actions'
It's clearer and remains backwards-compatible thanks to cmdliner's magic
Add missing relationships for computing action causes
the relationship wasn't displayed when it only concerned the old version
of a package, not the new one. Exhibited by e.g.:
`opam install custom_printf.109.15.00`
Fixed display of the error report
Merge pull request #1216 from OCamlPro/fix-cudf-lock

Add dose patch for clean exit on solver errors
Merge pull request #1218 from OCamlPro/switch-import-solver-fix

Fixed an issue that could happen in some cases of `opam switch import`
Remove travis version constraint on cohttp

(fixed on opam-rt upstream)
Merge pull request #1225 from OCamlPro/travis-cohttp

Remove travis version constraint on cohttp
Merge pull request #1223 from OCamlPro/complete-causes

Add missing relationships for computing action causes
Merge pull request #1217 from OCamlPro/pkg-flags

Add support for specifying package-specific flags
Adding positions to the OPAM parse-tree

This should finally give us proper locations when anything gets wrong in
a file. I'm confident this will save people more time than it took me to
add :)
Be more lax on OPAM files errors

eg print the error but don't block. This will let people fix the
error and update again. Closes #1125
Merge pull request #1222 from OCamlPro/file-positions

Adding file positions to the internal parse-tree
Merge pull request #1221 from OCamlPro/show-actions

Rename '--show' to '--show-actions'