LDraw Torus Generator

[Kevin]

OK, we need this, but then the header needs more tweaking.

The naming of torus primitives are tricky. A correct name would be:  48/tm48q?????.dat
The parttype should be: Unofficial_48_Primitive.
It should have a BFC statement:  0 BFC CERTIFY CCW
A scalable primitive must have four decimals on every x/y/z value.

OK, maybe I'm nitpicking, but these changes would make it usable.

Thanks for the additional feedback.  I have made the requested changes:

1) If the sections per circle is 48 or greater, "48\" is prepended to the name, and "_48" is inserted into the parttype. 
2) Added support for "unit" in the file name when the minor radius = 1
3) I corrected and verified the CCW winding for all quadrilaterals and added the BFC statement.
4) I have expanded the precision to 4 decimal places but allow truncation of trailing zeros for quads and edges.

Right now it only generates q-type tori.  Would it be useful to add i-, o-, and r- types as well?

Kevin