Keeping a set amount of detail logs

[lowbassman at gmail.com]

I've enabled "detail auth_log" and "detail reply_log" (it'd be great
if there was a way to tie auths and replies together from the
different log files somehow) and FreeRadius is creating new logs each
day.  I'm assuming that I'll need to take care of removing old logs on
my own?  Otherwise I'll be filling my disk up pretty quickly.
Thanks,
~Matt