integer: missing cast int(number)

[gorzel]

For integers Z, the cast from number to int is missing, only bigint is implemented.

>  ring rZ = integer,x,dp;
>   number q = 21331;
>   q;
21331
>   bigint(q);
21331 
>   int(q);    // BUG missing casts
0

Compare, with similar rings, where the cast exist.

>   ring rZ8 = (integer,8),x,dp;
>   number q = 7;
>   q;
7
>   bigint(q);
7
>   int(q);
7

> ring r32003=32003,x,dp;
> number q = 21331;
>   q;
-10672
>   bigint(q);
-10672
>   int(q);
-10672

[hannes]

was: access to wrong address in nrzInt