Foundation Classes - math_ComputeKronrodPointsAndWeights indexation goes beyond the limit

This issue is found during studying the results of CppCheck (#0033024).

The following block is invalid:

Standard_Integer aNd2 = Number/2;
Standard_Real *s = new Standard_Real[aNd2 + 2];
Standard_Real *t = new Standard_Real[aNd2 + 2];
Standard_Real *ss = s++;
Standard_Real *tt = t++;
  
for (i = -1; i <= aNd2; i++) {
    s[i] = 0.;
    t[i] = 0.;
}

Here, memory is allocated manually without usage of smart pointers (welcome memleaks!) and value is assigned to index -1 that is outside the allowed boundaries [0, aNd2 + 1]. Analysis shows that this class is passed to math::KronrodPointsAndWeights as alternative method of Kronrod poitns and weights calculation for high indices but it seems to be not used.

One should pick one of the following options:
1. Get rid of suspicious class.
2. Identify & fix all the issues, write tests to cover this functionality

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Analysis revealed that algorithm is OK, and pointer-based raw memory manipulation is correct in this particular case. It is worth adding explanatory comment and test to avoid misunderstanding in future.