0.4.1.6 Beta 11/29/2014
--User Changes
 None.

--Bug Fixes
 Fix broken continuity of randomness in OpenCL when using strips, broken in last build.
 Fix broken density filtering dimensions in OpenCL which left black lines, broken in last build.
 Fix broken preview update on when the only change is scale.
 Update density filtering progress bar to 100% in final render dialog when DE radius is 0 (disabled).

--Code Changes
 Make RendererBase::RandVec() virtual.