Plot idiograms of karyotypes, plasmids, circular chr. having a set of data.frames
for chromosome data and optionally mark data. Two styles of chromosomes can be used: without or with
visible chromatids (when not circular).
Supports micrometers, cM and Mb or any unit. Two styles of centromeres are available: triangular and rounded;
and six styles of marks: square (squareLeft), dots, cM (cMLeft), cenStyle, upArrow, downArrow;
its legend (label) can be drawn inline or to the right of karyotypes. Idiograms can also be plotted in
concentric circles. It is possible to calculate chromosome indices by Levan et al. (1964)