bracket_test

bracket_test
  bracket seeks points a, b, c which bracket a minimizer
  of a function f(x) so that f(a) > f(b) < f(c).

  Search begins with:
  x1: f(2) = -3.8382
  x2: f(2.5) = -6.16977

  bracket returns (a,b,c):

  a: f(6) = -27.1928
  b: f(6.5) = -28.2128
  c: f(7) = -27.9175
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