I raised this in sage-support, and am now reasonably convinced this is
a bug.  Guidelines say the next step is to raise it here.  The full
thread is at:
http://groups.google.com/group/sage-support/browse_thread/thread/02f3446e68381346#

but the summary is:
-------------------
atan2(3,0)   --> 1/2*pi
atan2(-3,0)  --> -1/2*pi
atan2(pi,0)  --> 1/2*pi
atan2(-pi,0) -->  RuntimeError: power::eval(): division by zero
--------------------

Thanks--
 Greg

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