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 MEP24: negative radius in polar plots
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Status
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*Discussion*

Branches and Pull requests
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None

Abstract
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It is clear that polar plots need to be able to gracefully handle
negative r values (not by clipping or reflection).

Detailed description
====================

One obvious application that we should support is bB plots (see
https://github.com/matplotlib/matplotlib/issues/1730#issuecomment-40815837),
but this seems more generally useful (for example growth rate as a
function of angle).  The assumption in the current code (as I
understand it) is that the center of the graph is `r==0`, however it
would be good to be able to set the center to be at any `r` (with any
value less than the offset clipped).

Implementation
==============


Related Issues
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#1730, #1603, #2203, #2133



Backward compatibility
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Alternatives
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