Add new CUTEst routines for the John function

[jfowkes]

CUTEst 2.2 added routines for the (Fritz) John function, defined as

$$ \mathcal{J}(x,\lambda_0,\lambda) = \lambda_0 f(x) + \langle \lambda, c(x) \rangle $$

(for more details please see https://en.wikipedia.org/wiki/Fritz_John_conditions)

The following new routines have been added to CUTEst 2.2:

• cdimohp
• cdimsg
• cdhj
• cshj
• cshj_threaded
• chjprod
• chjprod_threaded
• cisgrp
• cohprods
• cohprodsp
• cohprods_threaded
• timings_threaded

We should add support for these in PyCUTEst as appropriate.

[jfowkes]

For now I will prioritise (all for constrained problems):

• cdhj: evaluate the dense Hessian of the (Fritz) John function
• cshj: evaluate the sparse Hessian of the (Fritz) John function
• chjprod: product of Hessian of the (Fritz) John function with a vector
• cohprods: sparse product of (objective) Hessian with a vector

as we need these for some of our research.

[jfowkes]

Might also be good to support the following existing CUTEst routines:

• ufn: evaluate objective function
• cifn: evaluate objective function or constraint function
• cdhc: evaluate the Hessian of the constraint part of the Lagrangian
• chcprod: product of Hessian of the constraint part of the Lagrangian with a vector
• cchprods: products of Hessians of the constraint with a vector
• cshc: evaluate the Hessian of the constraint part of the Lagrangian (sparse)

These were either not used or not in CUTEr (the precursor to CUTEst).