challenge leaks memory

Created by: stephanemagnenat

Recently, under Linux asebachallenge seems to leak memory heavily. This is probably due to Qt as no changes were done in challenge since a time when it did not leak. I am using Qt 4.8.1 under Kubuntu 12.04 with kernel 3.2.0-27-generic x86_64.

Please test on your favourite platform and report any leak or non-leak.