Complex GamP(a, x) = Lower Regularized Incomplete Gamma Function
If a == 0 and x == 0, GamP(0, 0) = 0.
Else if a == 0 and x != 0, GamP(0, x!=0) = 1.
Else if a is a real integer < 0,
if x == 0, "Cannot take GamP(a, 0) if a is an integer < 0.
Else GamP(−int, x!=0) = 1.
Else if a.i == 0 and x.i == 0 and x.r > 0, use the real GamP(a.r, x.r) function.
Else GamP(a, x) = GamL(a, x) / Gam(a).
See: Regularized Gamma Function -- From MathWorld
And: Wolfram Function Evaluation -- GammaRegularized (GamP(a, x) = GammaRegularized[a, 0, x])
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