[DynareDev] Branch for Dynare 4.4 created

Hi,

I have finally created the branch for Dynare 4.4.

As usual, please apply the following rules:

- only bugfixes and documentation improvements are accepted on the 4.4 branch

- the workflow is the following: first commit the bugfix or documentation improvement on the master branch; then backport it to the 4.4 branch using the "git cherry-pick -x" command

Hopefully we'll make the 4.4.0 release soon. Once we have made various consistency checks on the 4.4.0 branch, I'll create the first release candidate for you to test.

Best,