Update NEWS with flint-2.4.4 release.
Update NEWS with flint-2.4.4 release.

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