[CM] mp numbers in s7

Bill Schottstaedt bil at ccrma.Stanford.EDU
Fri Jan 9 09:58:47 PST 2009

I've added support in s7 for multiprecision integer, ratio, real, and complex
numbers, including all the numeric functions.  Use the configure flag
--with-gmp.  It uses the gmp, mpfr, and mpc libraries.  Default float
precision is 128 bits, but can be set higher via bignum-precision.
Still a week or so of testing to do, but it currently passes the tests
in s7test.scm.  If this works out as I hope, I'll extend the mp arithmetic
to clm and snd.

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