Machine Definition changed to better represent a 3D Printer
Printbed now lies in quadrant 1 (i.e. X>=0, Y>=0) and is no longer centered on the origin.
Parameters X-Offset and Y-Offset were added to represent the distance from X & Y home positions
to edge of the printbed.
Slicerpanel now uses the placement of the part(s) for the X,Y&Z gcode positions.
The X, Y, & Z Spin boxes on the form are now overrides for the part position.
If you enable them, the actual positions will be ignored and the specified values will
be used instead.