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* m4/gmp.m4: New file; adds cu_GMP, which detects GNU MP. * configure.ac: Use cu_GMP. * src/Makefile.am: Link factor against libgmp if available. * src/factor.c: Use GNU MP if it is available. (emit_factor, emit_ul_factor, factor_using_division, factor_using_pollard_rho, extract_factors_multi, sort_and_print_factors, free_factors): new functions for the arbitrary-precision implementation, taken from an example in GNU MP. (factor_wheel): Renamed; was called factor. (print_factors_single): Renamed; was called print_factors. (print_factors): New function, chooses between the single- and arbitrary-precision algorithms according to availability of GNU MP and the length of the number to be factored. (usage, main): New options --bignum and --no-bignum. * coreutils.texi (factor invocation): Document new command-line options for the MP implementation and update the performance numbers to take into account the asymptotically faster algorithm. * TODO: Remove item about factoring large primes (it's done). * m4/gmp.m4: Add support for --without-gmp. * NEWS: Mention the new feature.