Add finer binning in Phistar to ZFinderPlotter

We now use bins of size 0.001 (down from 0.01) and extend the total
range out to 4 from 1. ATLAS uses these finer bins, and goes out to the
mid 3s.

The range in the ZDefinitionWorkspace is changed to a maximum of 10 to
insure that we have no problems with clipping.