Carry vars btwn modes

If this button is off, then each of the modes DotPlot, XYPlot,
Rotate, and Tour has its own idea of which variables it is plotting,
and is not influenced by variable selection actions occurring in the
other modes.  If it is on, an attempt is made to establish continuity
of selected variables between modes.  For example, if you select a
particular three variables in Rotate, then move to Tour, the Tour
will begin with those same three variables.

This can be set in the XGobi resource file.  The default is

*carryVars:   False

