Internal function.
.identifyGrobToPlot(grobNamesi, toPlot, takeFromPlotObj)# S4 method for .spadesGrob,list
.identifyGrobToPlot(grobNamesi, toPlot,
  takeFromPlotObj)
name of the object to plot
list containing the objects to plot, made as a call to the
Plot function
Logical. Should the data come from the argument passed
into Plot (TRUE), or from the (.spadesEnv)
(FALSE).
Because the Plot function can use the global environment as a source of objects to plot, not just the call itself, this function identifies where the data for the grob should come from, the current call or the global environment.