Fix comparison with signed zero
More regular names of primitives
Fix compatiblility with sbcl-1.4.5
Improve Texmacs interface
Fix 'gmp-bignum-isqrt'
Support GMP in nonstandard location
Fix scope
Fix build with sbcl-1.3.13
Fix compare for DirectProduct(dim:NNI, PositiveInteger)
Remove a few $Lisp calls