Make cf(2^(1/3)) work



Hello,
the code in the attachment adds continued fraction expansion for simple 
nth degree roots of integers.
The code can be placed into combin.lisp (cfeval needs update).
If somebody knows what command computes entier of radicals pleas tell 
since my radical->bfloat->float->integer conversionlooks ugly.

--
Andrei Zorine

Attached file: cfnroot.lisp