[C2E] - Calculation of the moments of S(Q,w)

[PeterParker]

New request from Spencer:

Addition to C2E - the calculation of the moments of S(Q,w) i.e.

• Zero-th moment: M0(Q) =Integral_over_w[S(Q,w)]
• n-th moment: Mn(Q) =Integral_over_w[w^n^S(Q,w)]/M0(Q) for n=1 to 4.

Currently have a Python script to do it but it would be more efficient as an Algorithm. This routine would be used by both Indirect & Direct.As a generic algorithm it would do

• Zero-th moment: M0 =Integral_over_x[y]

• n-th moment: Mn =Integral_over_x[x^n^y]/M0 for n=1 to 4.
  There is use for it elsewhere.

  Keywords: C2E

[PeterParker]

This issue was originally trac ticket 5300