add ability to select display (A or B) from which we get trace/coord

some general GUI improvements & code cleanups

make plotter really repaint itsefl when some property of the plot is changed

add THD computation for simple traces of power spectrum

added many HPGL example plots (for the sake of testing mainly)

added some forgoten files to Hg

(0) -30 -10 -6 +6 +10 +30 tip

mercurial