pari_init and programs using libpari.

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

Hello pari-dev,

We are considering adding a new function as an optionnal replacement for
pari_init. The idea is to add a flag that would let the user some
behaviour of pari_init tpht might interfer with the program, in
particular the installation of a signa handler.

We consider adding a function:
void pari_init_fancy(size_t parisize, ulong maxprime, long initops)

If you have ran into trouble with pari_init() and would like
improvements, now it is time to speak up.

Cheers,
Bill.