Tweak games/py-mnemosyne version 2.3.1_1,1
Update dns/dnsperf to version 2.0.0.0_2
Update devel/tortoisehg to version 3.1.1
Update archivers/p5-IO-Compress-Lzf to version 2.066
Update databases/cassandra to version 1.2.18_1