Directly Wrap MPA RTC Curves for DNC Compliance

[sbondorf]

Current behavior:

• The MinPlus_MPARTC class dispatches operations to their MPA RTC implementation in ch.ethz.rtc.kernel.CurveMath.
• The results is, of course, returned as an MPA_RTC curve, an instance of class ch.ethz.rtc.kernel.Curve.
• In order to wrap this MPA RTC curve into an instance of a DNC-inferace compliant class, the code currently calls Calculator.getInstance().getCurveFactory().create{Arrival,Service,MaxService}Curve(String str).

In theory, this allows to create a DNC curve, yet, that is an option we never use. The calculator config does not change during runtime and therefore the DNC will always continue working with the MPA RTC backend. For that reason, MinPlus_MPARTC should directly create an instance of {Arrival,Service,MaxService}Curve_MPARTC_PwAffine that wraps the MPA RTC curve.

To achieve this, the classes {Arrival,Service,MaxService}Curve_MPARTC_PwAffine need to be extended by a {Arrival,Service,MaxService}Curve_MPARTC_PwAffine(ch.ethz.rtc.kernel.Curve curve) method each. It may be possible to just dispatch to another method creating a wrapper for curve.

[sbondorf]

Ok, the methods are actually there. @phschon already implemented them, I simply overlooked them.

This is great as it means I just have to change the return-curve constructions in MinPlus_MPARTC.

[sbondorf]

Implemented in commit cd2109e

In two unrepresentative runs of the functional tests, this change resulted in an overall speedup between 10% and 20%.

[sbondorf]

There is more to do here, I am re-opening the issue.