Fix for var[n] DataRef values.
All objects in a train share the lead objects' var[n] DataRefs.
Add "And" command.
Reduce number of float/double type conversions.
Add support for articulated vehicles / semi-trailer trucks.
Objects give way to the user's plane and to AI planes.
Check use of var[] DataRef with "when" command.
Support setting multiple DataRefs at a waypoint.
Disallow pause both before and after backup command.
Fix for object heading while reversing.
Make Windows Makefile more robust in face of build errors.
Release 1.30