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Document that generate-minimax-by-Remez.gp has issues.

--- a/lib/math/ancillary/generate-minimax-by-Remez.gp

+++ b/lib/math/ancillary/generate-minimax-by-Remez.gp

@@ -1,6 +1,8 @@

 /*

   Attempts to find a minimax polynomial of degree n for f via Remez

-  algorithm.

+  algorithm. The Remez algorithm appears to be slightly shot, but

+  the initial step of approximating by Chebyshev nodes works, and

+  is usually good enough.

  */

 { chebyshev_node(a, b, k, n) = my(p, m, c);