New galdata package and polgalois().

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

Hello PARI-dev,

I have updated the galdata packages and polgalois() routine in CVS to
output the transitive group according to the GAP 4 transitive groups
library by Alexander Hulpke <http://www.gap-system.org/Datalib/trans.html>
as a fourth component:

For example:

? polgalois(x^6+3*x^3+1)
%2 = [12, -1, 1, "D(6) = S(3)[x]2"]

For degree 8 to 11, you need a new galdata package, available here:
<http://pari.math.u-bordeaux.fr/download.html#packages>.

This feature was proposed by Xavier Roblot.

Cheers,
Bill.