Riemann-Siegel formula

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• The Riemann-Siegel formula takes O(t^1/2) operations per point.
• I checked the derivation of the formula.
• Hurrah! No typographical or arithmetic or simple algebraic errors.
• C₆ = 1/563585608581120/pi^12*P18 + 18889/237817036800/pi^8*P10 + 17/652298158080/pi^10*P14 + 367/7864320/pi^6*P6 + 5/2048/pi^4*P2