getProfileSup_optim: Generic profile sup function computation with optim
In profExtrema: Compute and Visualize Profile Extrema Functions

Compute profile sup function for an arbitrary matrix Psi with the L-BFGS-B algorithm of optim.

1	getProfileSup_optim(eta, Psi, f, fprime, d, options = NULL)

`eta`	p dimensional point where the function is to be evaluated
`Psi`	projection matrix of dimensions `p x d`
`f`	function to be optimized (takes a vector y of dimension d and returns a real number)
`fprime`	derivative of f (same format, returning a d dimensional vector)
`d`	dimension of the input for f
`options`	a list containing the options to be passed to optim: `par:`contains the starting point (a point in dimension d-1) `lower:` the lower bounds for the optimization domain (see optim for details) `upper:`the upper bounds for the optimization domain (see optim for details)