f the EQP problem.
info : Dict
    Dictionary containing the following:

        - niter : Number of iterations.
        - stop_cond : Reason for algorithm termination:
            1. Iteration limit was reached;
            2. Reached the trust-region boundary;
            3. Negative curvature detected;
            4. Tolerance was satisfied.
        - allvecs : List containing all intermediary vectors (optional).
        - hits_boundary : True if the proposed step is on the boundary
          of the trust region.

Notes
-----
Implementation of Algorithm 6.2 on [1]_.

In the absence of spherical and box constraints, for sufficient
iterations, the method returns a truly optimal result.
In the presence of those constraints, the value returned is only
a inexpensive approximation of the optimal value.

References
----------
.. [1] Gould, Nicholas IM, Mary E. Hribar, and Jorge Nocedal.
       "On the solution of equality constrained quadratic
        programming problems arising in optimization."
        SIAM Journal on Scientific Computing 23.4 (2001): 1376-1395.
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