v1.0 final:
- constr (new module) and cost module updated with new collection functions
- lib.diff, lib.integr module created to collect methods for polynomial based derivatives and integrations. The integrations are for normal tabulated function and for quaternions. lib.integr is tested into lib.testing.integr
- capability to link the solver to any objective function added (and lib.save, lib.read updated to store this info)
- xbcomponent.py: added code to evaluate generic cost function