Python-gmp

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* split gmpy.c/gmpy.h introducing C-API interface (Pearu's suggestion)
* cleanup some casts using Pearu's new macros
* further cache-tweaks at Pearu's suggestion (macros introduced)
* added sign (Pearu's request), getbit, setbit
* added docstrings
* renamed copy functions to start with _ ('internal, private')
* added .comb as a synonym of .bincoef

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* performance tweaks via mpz-caching & fixed-constants
* added get/set functions for zcache, zco min/max
* added get-only function for versions (of gmp, and of gmpy)
* removed all 'traces' of mutability (to be re-done... much later!)
* cleaned up all of the mpz_cmp_ui(X,0) to mpz_sgn(X)
* cleaned up Py_BuildValue usage (N vs O, explicit-() for tuples)
* added numdigits, lowbits, root, next_prime, invert, popcount,
* hamdist, scan0, scan1
* renamed bin to bincoef

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15 Nov 2000

* pre-alpha: bugfixes re formatting (tx, Peanu!)
* no tags on oct() and hex() of mpz's
* insert 'tagoff' in options (gmpy.mpz() vs mpz() in repr) (for Peanu!)
* speedups for _nonzero & _cmp (tx, Peanu!)
* slight speedup (7/8%?) for excess reallocs 4<->8 bytes (Peanu's help!)
* added copy/fcopy; bin; fib; remove

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6 Nov 2000

* pre-alpha --- first placed on sourceforge