documentation wrong for groupbaseexpire

[Dan Merillat]

I had it set to blank in inn.conf, and it assumed true for some reason.
I found this because expireover in groupbased mode dosn't work without delayrm...
if -z (filename) is null, it attempts to fopen, gets a null filepointer then
dies.

There's a lot of tests in OVctl() for things, but if groupbased expire is true,
it assumes delayrm is as well.  Tests needed around line 378.

Setting groupbasexpire explicitly to false in inn.conf fixed my problems.

--Dan