Fix atan/taylor bug and add atan2/taylor.
qd-fun.lisp: o Fix issue with atan-qd/taylor for large args. We use the relationship atan(x) = pi/2-atan(1/x) for x > 1. o Add atan2-qd/taylor. This appears to be much faster than atan2-qd/newton. timing.lisp: o Add timing test for atan2-qd.
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