ZOOM Paper Space/Model Space for R12/R13/R14
Provides an automated method of zooming in Paper Space/Model Space drawings.
AutoCAD assumes you know when you are in model space or paper space. This
creates a problem if you are in MS and want to zoom in/out or pan and want to
retain the viewport scaling and alignment with PS.
This redefined ZOOM command will change to PS for you, zoom, and put you back
in MS. If in PS already, you will remain there. The pan function works the