Implement  molefraction(), massfraction(), molarity()
and molardensity() functions in the volvars and use it
instead of volvars.fluidstate().x().

Implement a saturation() function in the volvars and use it
instead of volvars.fluidstate().saturation(phaseIdx).

[test_boxmpnckinetic] Update reference solution

After commit 8557b77e
which fixed shadowed variables in the fluidsystem,
the test did not pass anymore. In addition, a new grid
creator is used now which also leads to slight differences in the
coordinates. Therefore, the reference solution had to be updated.

See merge request !54

After commit 8557b77e
which fixed shadowed variables in the fluidsystem,
the test did not pass anymore. In addition, a new grid
creator is used now which also leads to slight differences in the
coordinates. Therefore, the reference solution had to be updated.

Feature/fs250 folder structure



See merge request !52

The bash script accepts any number of files as input arguments:
bash ./fix_includes file1 [file2 ...]

[folder structure] move porousmediumflow/implicit/nonisothermal to porousmediumflow/nonisothermal/implicit

Added the use of convenience functions also in the 2pncminlocalresidual,
which i forgot in the previous commit 2c0b5..b82c76b4.

2pnc and 2pncmin are now using only convenience functions as required in FS211
instead of directly calling the fluidstate.
The necessary convenienience functions (mass and moleFraction, molarity) were implemented.

Added #if HAVE_MPI before class instantiation of NonoverlappingSolverTraits
and OverlappingSolverTraits.

Reviewed by Bernd.

Fix shadowing warning in boundingboxtree.h



See merge request !50

[doxygen] Add auto-deletion of the html folder, so that doxygen always builds a new documentation



See merge request !49

The function definition requires brackets (). The function keyword
is unnecessary and results in less portable shell code, see:
http://unix.stackexchange.com/questions/73750/difference-between-function-foo-and-foo

Instead of calling fluidstate().FLUIDPROPERTY(), the now implemented
convenience functions are used.

Reviewed by kweis

Feature/tensorgrid

Implements the feature of yasp grid, which is able to take an arbitrary number of refine/interface points. Between these points the number of cells as well as the grading can be chosen individually.

See merge request !47

This changes the reference solutions.

This requires updating the reference solutions.
For mpnckinetic it was not able to check, whether the reference solution was already broken before.

The grids gets a position array from which the grid is constructed. Optional arguments are the number of cells and the grading