Switch to using atan-qd/taylor as the default atan implementation.
qd-fun.lisp: o Use atan-qd/taylor and atan2-qd/taylor as the atan-qd and atan2-qd implementation. o Fix bug in atan-qd/taylor. We need a special case for x small where we don't want to use the table. (Found by our rt-test. Yay!) rt-tests.lisp: o Add comment for oct.atan.4 for why it works.
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