Small visual improvement to gcd_hgcd
Small visual improvement to gcd_hgcd

dsroche/flint2,wbhart/flint2,fredrik-johansson/flint2,dsroche/flint2,jpflori/flint2,fredrik-johansson/flint2,dsroche/flint2,jpflori/flint2,wbhart/flint2,jpflori/flint2,jpflori/flint2,fredrik-johansson/flint2,wbhart/flint2,dsroche/flint2