DCNonLinEquation using real JScience objects
Newton iteration method complete using real matrices
myNewtonRapComp

Continuation method implemented.
Newton-Raphson now detects divergence
Newton-Raphson with continuation method complete
Some correction in the Newton-Raphson method
Newton-Raphson works
DCNonLinEquation update
major changes ...

I screwed up this commit sorry.
Revert "major changes ..."

This reverts commit 4116feaac62620308faf98dcc87d023b8b14bf79.
DCNonLinEquation inherit from DCEquation

extended from DCEquation, but now does not have C matrix because
DCNonLinEquation only cares about DC point solving, and not transient
DCNonLinEquation solve method complete

solve in this class will only solve DC points.
NonLinCircuitElement update

now NonLinCircuitElements apply their contribution to the
DCNonLinEquation
NonLinCircuitElement update

just eliminating some redundant elements in NonLinCircuitElement
Circuit now either linear or not
DCNonLinEquation complete

The DCNonLinEquation is now complete, and is hidden behind DCEquation.
The DCAnalysis will create a DCNonLinEquation rather than DCEquation if
there is even a single NonLonCircuitElement amongs the elements of the
Circuit.