Consider increase verbosity for AD?

[XingyuZhang2018]

I consistently receive warnings similar to the following:

  if alg_rrule.verbosity >= 0
      gauge = abs(imag(vdΔv))
      gauge > alg_primal.tol &&
          @warn "`eigsolve` cotangent for eigenvector $i is sensitive to gauge choice: (|gauge| = $gauge)"
  end

I believe that setting alg_rrule.verbosity >= 1 would be a more appropriate threshold.