15-02-21: Examples optim_sa corrected and updated
03-01-21: Help file modified; Vignette updated; minor bugfixes
20-10-17: Vignette added
22-09-17: Bugfix: Invalid starting variable combinations stop the optimization and generate an error message.
27-06-17: Bugfix: Solving loss functions of dimension 1 is now possible with optim_nm
21-05-17: optimization Version 1.0-4 released