Fixed head updates so that removing a monitor on the left no longer
makes stumpwm have a heart attack.
Merge branch 'master' of https://github.com/sabetts/stumpwm
Merge branch 'master' of github.com:sabetts/stumpwm
Sort screen heads by something saner than ID.
Merge branch 'master' of github.com:robgssp/stumpwm
Merge pull request #14 from robgssp/master

Monitor Reconfiguration Fix