Tip: fix for broken behavior (just in case)

[David Bovill]

Some times after a crash, Rev will lose it's links between controls and
behaviors. It can take a long time to track this down as

put the behavior of grp 1

returns as expected. It is just that none of the behavior scripts get
called. Restarting does not help. It's happened 3 times for me, so if this
happens to you this is the fix:

set the behavior of grp 1 to the behavior of grp 1

You only need to do this once for any given behavior, to fix all links for
that behavior, but you do need to do it for each behavior you use. See bug
#8014 <http://quality.runrev.com/qacenter/show_bug.cgi?id=8014> and vote for
it if it affects you.