Some information I've not seen anywhere about f_torus equivalents for a 
couple of the new v38 torus spindle modes. The merge and intersection 
spindle modes have long existed with the f_torus, but via value 
arguments. See the attached image.

So, you can get a couple of the spindle tori with isosurfaces and 
f_torus in versions prior to v38.

While at it, some timing information from povr with new solver branch 
updates.

torus regular to sturm solver  2.070 -> 2.393  +15.60%
torus sturm to f_torus         2.393 -> 3.605  +50.65%

Bill P.

Question. Does anyone know why f_torus2() exists? Best I can tell it's a 
much, much, less efficient implementation with an additional capability 
to tweak the values. That last can be done faster in other ways. Current 
plan is to delete f_torus2() in povr.

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