Blurb::
Verify the quality of analytic gradients
Description::
``verify_level`` instructs the NPSOL and NLSSOL algorithms to perform
their own finite difference verification of the gradients provided by
Dakota.  Typically these are used to verify ``analytic_gradients``
produced by a simulation code, though the option can be used with
other Dakota-supplied gradient types including numerical or mixed.

Level 1 will verify the objective gradients, level 2, the nonlinear
constraint gradients, and level 3, both.  See the Optional Input
Parameters section of the NPSOL manual  :cite:p:`Gil86` for additional
information, including options to verify at the user-supplied initial
point vs. first feasible point.
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