NTL/GMP support in GP

[Bill Allombert <allomber@math.u-bordeaux.fr>]

Hello developers,

I am planning to add optionnal NTL/GMP support under GP.
The current state of the work is available at 
http://www.math.u-bordeaux.fr/~allomber/pari-ntl.tgz

This support consists currently of a C++ file ntlpari.c, and a GP file ntl.gp
This is meant to work with NTL compiled with full GMP support. NTL and GMP
need to be install'ed.

What need to be done ?

1) Add a --with-ntl option to Configure
2) If --with-ntl, change makefiles so that it
2.1) compile ntlpari.c with g++ as ntlpari.o
2.2) link gp with ntlpari.o and -lgmp -lntl , with *g++*, not gcc.
3) load ntl.gp in GP at startup.

Step 4 can be replaced by adding new functions to GP directly without resorting
to install(), but there is no easy way to do it currently.

NOTE 1: for other compilers than gcc, I do not what to do, I am not even sure
that NTL/GMP or ntlpari.c will compile.

NOTE 2:
It is easy to add GMP interface to ntlpari (in fact it is already here). However
it will not be transparent at all.

Bill.