Continued the switch to [-1,1]^2.  Scaling is off - but it's fast!
Some small improvements to make the transformation behavior align with
the working version before the multiparam adventure, and to improve
efficiency.  At this point, the affine transformations match in java and
in C++ land.  But the scaling is still strange.  So the mystery
remains...
Um.  Oops.  Got complex multiplication wrong.  How come noone
complained? :)