Groups now encapsulate instead of extending their ArrayLists, to limit the number of ways it can be modified
Various resulting tweaks
Fixes issue 631
git-svn-id: http://svn.dmdirc.com/trunk@385900569f92-eb28-0410-84fd-f71c24880f
ActionManagerTest now deletes test dirs before running
ActionManager.makeGroup no longer fails if the group directory already exists on disk, and now throws an IllegalArgumentException if directory creation is needed and fails
Fixes issue 1014
git-svn-id: http://svn.dmdirc.com/trunk@367000569f92-eb28-0410-84fd-f71c24880f