Fix up headers mentioning County Council of Gipuzkoa, Department of Environment and Planning

Signed-off-by: Jody Garnett <jody.garnett@gmail.com>
Add standard header to NSIS installer script

Signed-off-by: Jody Garnett <jody.garnett@gmail.com>
Update the build instructions

Signed-off-by: Jody Garnett <jody.garnett@gmail.com>
clean up comments

Signed-off-by: Jody Garnett <jody.garnett@gmail.com>
Fix up headers mentioning County Council of Gipuzkoa, Department of Environment and Planning

Signed-off-by: Jody Garnett <jody.garnett@gmail.com>
clean up download messages