ined, independent of the method in use.
<li> Cray vector systems: CPU frequency could be determined from
     <code>sysconf(_SC_CLK_TCK)</code>, since it seems to be clock cycle
     based.  Is this true for all Cray systems?  Would like some documentation
     or something to confirm.
</ul>


<h4>Documentation</h4>
<ul>
<li> <code>mpz_inp_str</code> (etc) doesn't say when it stops reading digits.
<li> <code>mpn_get_str</code> isn't terribly clear about how many digits it
     produces.  It'd probably be po