New mpz_lucas... functions

[Wes Freeman]

> Is there a license that would make this easier to include in GMP?  I
> wouldn't want to choose a wrong license and have my code rejected for that
> reason.
>
> Also, I'd like to 'publish' the code, but I don't have a web site and am not
> sure where to post it so that it is publicly available.  Could you recommend
> a place that is easy and free for everyone to access?
>
> -David C.

For sharing the code: github or bitbucket are popular (and free for
open source), pick your choice of git or mercurial.

For licensing: GNU's LPGL is probably appropriate, if you want to
match GMP's license. More info here:
http://www.gnu.org/licenses/gpl-faq.html and here:
http://www.gnu.org/licenses/gpl-howto.html and here:
http://www.gnu.org/licenses/lgpl.html

I would like to see k be mpz_t, for those really big numbers. :) Maybe
we can optimize it a bit.

Wes