make profileExists() part of the nsIProfile interface, so I can
get at it from JS. startCommunicator is now startApprunner.
get RenameProfile() and DeleteProfile() to work better.
make the delete profile dialog size to content.
change the 2nd arg of DeleteProfile() to be a bool, and not a string.
use MakeUnique() to prevent undesired collisions of profiles on disk.
git-svn-id: svn://10.0.0.236/trunk@50205 18797224-902f-48f8-a5cc-f745e15eee43
