v1.1.0-rc2

v1.1 Release Candidate 2

Main changes since rc1:

• New switches alr toolchain --disable-assistant, alr toolchain --select <crate>[=version]
• Lock file is now stored inside ./alire
• Better cleanup of temporary files.
• Bugfixes for issues reported about rc1.
• alr index is now equivalent to alr index --list
• The solver has now a timeout, defaulting to 5 seconds.
• Internal refactorings for better reusability.

For the full change log, see PRs #788 #389 #793 #797 #799 #803 #804 #805 #806 #807 #808 #809 #810 #813 #815 #816 #818