New plot styles and style options

• 3D plot style with zerrorfill. See zerrorfill (p. ), fenceplots (p. ) and http://gnuplot.info/demo_5.4/zerror.htmlzerror demo.

• Beeswarm plots. See set jitter (p. ), beeswarm (p. ) and http://gnuplot.info/demo_5.4/jitter.htmlbeeswarm plot demo

• The symbol used for individual points in a plot can be controlled by data values (see pointtype variable (p. ))