Complex E1(x) Exponential Integral Function One
For E1(x) with x.i == 0, use the real E1(x.r) function.
See: Real E1(x) Exponential Integral Function One
Else E1(x) = GamU(0, x) − (Ln(−x) − Ln(−1/x))/2 + Ln(x).
See: Exponential Integral -- From MathWorld
And: Wolfram Function Evaluation -- ExpIntegralEi (E1(x) = −Ei(−x))
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