％CHECKBOUNDS Move the initial point within the (valid) bounds.
％ [X,LB,UB,X,FLAG] = CHECKBOUNDS(x0,LB,UB,nvars)
％ checks that the upper and lower
％ bounds are valid (LB <= UB) and the same length as X (pad with -inf/inf
％ if necessary) warn if too long. Also make LB and UB vectors if not
％ already.
％ Finally, inf in LB or -inf in UB throws an error.
