Smithgrid and polar plots could not discern between xgridwidth and
xbrushwidth. This is now available, similar to straight line plotting.
Tested also for PS and SVG.
added to strucht graph
Use only these data for plotting.
If zooming a plot windows, set as an extra parameter the graph id
of the 'mother graph'. Copy its color and line data to the new graph.
This is done by an extra parameter sgraphid to the internal plot
command that is issued in fcn PlotWindowProc().
Thus zooming will keep the background, text/line and graph colors.
Function setcolor() will always look into the colorarray of the
current graph.
New variable gridwidth overrides xbrushwidth for graphs.
Fcn DevDrawLine() with boolean flag if grid is plotted.
Postscript, Gnuplot and X11 not (yet) supported.