* 0.19:   00-09-
        - added user-definable clipping region (edit region with mode C)
          auto-shrinkwrap and fully expand user clip with ctrl-W and ctrl-A
        - added ability to drag floors and/or ceilings seperately in the side
          view by holding down control or shift, respectively.
        - added 'change map' command in script editor

* 0.18:   00-08-28
        - maintenance release