Better exp-integral-e computation and fix for incomplete-gamma-tail.
For exp-integral-e, use the series for small z and the incomplete-gamma-tail for near the negative real axis. Otherwise, use the continued fraction. In incomplete-gamma-tail, we were using the continued fraction instead of the incomplete-gamma function for the region just below the negative real axis. We should use the cf except in that region.
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26ef83a4
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