Multi-threaded installs

[pgjones]

Package manager should build up a dict of packages to install against dependencies outstanding. Then all packages without any outstanding dependencies should be installed in parallel. This requires making LocalPackage a thread.

[wasalski]

Are you sure this is the right thing to do? I see the performance gains, but wouldn't it make it more difficult for the user to debug any issues?

[pgjones]

This can only come after the package logging, which should in its error handling make it much clearer to the user what the problem is. The only difference should be that the user doesn't see the normal output if it succeeds, rather only on fail.

[pgjones]

I'm still thinking about the best way to do this, It won't be ready for the beta release - thus removed from milestone.