Nameshar/Noirbits — pull request #4 by ftcminer (2013-07-02 20:37:41+00:00)
Title: Impl. 4hr. retarget & fixed getnetworkhashps

Next block retargets if no retargets during the last 4 hours
getnetworkhashps : replaced block interval constant to match Noirbits
(60 instead of 2016)