Python 3 fix: dictionary changed size during iteration
Python 3 fix: dictionary changed size during iteration

Under python 3, this error would pop as soon as a user or guest times out.

hsoft/slimbb,hsoft/DjangoBB,agepoly/DjangoBB,slav0nic/DjangoBB,hsoft/DjangoBB,saifrahmed/DjangoBB,slav0nic/DjangoBB,agepoly/DjangoBB,agepoly/DjangoBB,hsoft/DjangoBB,hsoft/slimbb,hsoft/slimbb,saifrahmed/DjangoBB,slav0nic/DjangoBB,saifrahmed/DjangoBB