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[polygamma] Remove series acceleration from polygamma_nearzero as it appears to make no real difference to the number of terms required.

[polygamma] Fix integer overflow in branch check case, and bail out of transition code is the number of series evaluations is too high.

Conflicts fixed by regenerating docs:
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[polygamma] Document new method for negative x in code comments, simply some code, change table to coefficients to store only non-zero values.

[polygamma] Change low order negative-x cases to use new polynomial method.  Change expected error rates to match.

Add tests for cos_pi and sin_pi.
Doc regen.

[polygamma] Fix GCC failures, a few bugs and forward policy arguments.  Fix test data to be 128-bit safe.