Configure Windows Installer to allow silent install
This is a feature request from a university wanting to do an unattended installation of Dynare on a computer pool. The NSIS installer we use seems to not be configured for silent installs, i.e. passing '/D /d=test_directory' does not work.
We should follow the instructions at http://nsis.sourceforge.net/Docs/Chapter4.html#silent t to allow for this.