Windows: Fix compilation error caused by latest MacOSX change.

Windows: Fix compilation error caused by latest MacOSX change.

Increment version to 1.18. Update user guide PDF file.

MacOSX: increment bundle version to 1.17.22

Increment version to 1.16. Update user guide PDF file.

Increment version to 1.15. Update user guide PDF file.

Increment version to 1.14. Update user guide PDF file.

Increment version to 1.13

Linux: modify official build script to use different build directorie…

…s for wxWidgets console and GUI builds.

MacOSX: Set properly the version in the bundle and the installation p…

…ackage. Allow downgrading using older installers.