[Changeset] plotyy leaves traces of previous plots

[David Bateman]

David Bateman wrote:
> In any case, even if you don't accept the changeset completely, the
> change to __go_draw_axes__ should be applied as it fixes the issue of
> the duplicated tics in plotyy windows.


Here is a changeset of the bit that should be committed that doesn't
affect the newplot issues.

D.
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