Merge pull request #803 from dsheets/master

Actually build opam_admin.native since a67bb720f99497c85e1afd
Merge pull request #801 from AltGr/fix-#757-#794

Fix #757 #794
Added a warning when adding a local repo without a 'packages' or 'compilers' directory
Closes #767 (although we only check for the directories here, that should be enough)
Going on after upgrade to 1.1, rather than ignoring command
Fixes #734 (ok, I didn't add a prompt ; but I put in a big red message, shouldn't
that be enough ? :p)
Merge pull request #804 from AltGr/fix-#792

Fix #792
Merge pull request #802 from AltGr/fix-#734-#767

Fix #734 #767
Adding explicit options to add/remove from the 'installed roots' package set
Closes #760
Revert "Enabling content compression in curl" since it breaks untarring distfiles.

This reverts commit 3c5e80c5c9fa4cc14691a3ac3912d316d1e1af34.  See #757
Merge pull request #811 from avsm/master

Revert "Enabling content compression in curl"
fix opam pin with local opam file
fix exists_dir
fix opam pin when no version and name
Merge pull request #805 from AltGr/fix-#760

Adding explicit options to add/remove from the 'installed roots' package set
Fix #815
Request HTTP compression and obey Content-Disposition if possible

Also modifies OpamFilename.download semantics to allow the ~dst
to be a directory. Fixes OCamlPro/opam#757.
Merge pull request #816 from dsheets/http_conneg

Request HTTP compression and obey Content-Disposition if possible
Colorising opam switch list
fix: opam pin xxx.git#master
Added an option to update repos only (no dev packages)
Display backtrace when exiting with error code and debug is set