* modules/gmpmod/mpz_glue.c (mpzmod_digits): new function

(mpzmod_create): Can now be called with two args, one string of
digits and an integer base.
(mpzmod_sqrtrem): new function
(mpzmod_gcdext): new function
(mpzmod_gcdext2): new function
(init_gmpmod_programs): Registered new functions. Fixed powm bug.

Rev: src/modules/gmpmod/mpz_glue.c:1.8