changed pernet stein to use new fmpq_mat_solve_fmpz_mat function
changed pernet stein to use new fmpq_mat_solve_fmpz_mat function

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