Fix the alloc issue in printing of constant polynomials / Q
Fix the alloc issue in printing of constant polynomials / Q

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