* getParam<bool> implicitly converts to Scalar, which is nasty ...

* old solution was created with wrong BCs (wrong position for BCs used)

* Input file was wrong

* still fails ...

* used in dCCdFace
* should be slightly faster
* add some docu

* faceVars now automatically incorporate Dirichlet BCs, if required
* simplifies fluxvars

* can be used like elemVolVars: elemFaceVars[scvf]

* do some clean-up

* do some clean-up, too

* get method is very expensive

* obsolete

* fixes convergence problem

* Newton does not converge!

Feature/1p on new next

See merge request !570