[Fix #347] Move 'users' from tag-order to group-order
[Fix #355] Do not set launchd environment variables

Setting environment variables for launchd processes is unreliable.
Finder and all Finder launched programs have to be restarted for the
new environment variables to take effect.
Merge remote-tracking branch 'upstream/master'
[Fix #357] Set alias gcO to check out hunks interactively
Merge remote-tracking branch 'upstream/master'