rm self._pswriter.write lookups from draw_markers
fixed a bug in draw_markers and draw_lines
fixed an array as truth value bug in ps with numpy
changed suggested ghostscript version from 8.16 to 7.07
made new API default in PS
fixed for numpy array scalars (thanks Eric!)
Fixed image.aspect in matplotlib.template.
Aspect handling modified for imshow.
Improvements to new API: draw_markers (masked) and draw_lines
Reworked the handling of aspect ratio so that it follows redraw events - EF
