Gauss-Kronrod may have a few problems

It looks like the JACOBI_21 scheme in GaussKronrodPts.h is problematic. The number of points should be odd, but this scheme doesn't have a node at x=0 as it should.

Put in error trapping for consistency on number of nodes at least.
Do a sanity check on the other methods as well.

See here for more information.

Edited Nov 11, 2017 by James Sutherland

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