Improve properties

See merge request !630

* do not inherit from ModelProperties
* use CMAKE_GUARD to skip test if alugrid not found

* add new test, only checking a simple scvf
* improve free-flow specific test

* use CellCenterPrimaryVariables instead of PrimaryVariables

* minimal scvf implementation, contains dofIndex() and localFaceIndex()

* set type in FreeFlow properties
* clean-up header
* return const ref instead of copies

* use correct includes and inheritance

* include dumux/common/properties.hh
  instead of dumux/common/basicproperties.hh
* do not inherit from LinearSolverTypeTag and
  NumericModel anymore because those type tags don't exist anymore

* header does not exist anymore

* use dumux/common/properties.hh instead of dumux/common/propertysystem.hh

* The phyiscal model now only inherits from the PorousMediumFlow type tag
* fix includes

* include dumux/common/properties.hh instead of
  dumux/common/basicproperties.hh and dumux/common/propertysystem.hh

* can be extracted from BCRS matrix directly
* check for Matrix == BCRS matrix in a more concise way

* define JacobianMatrix, SolutionVector and
  LinearSolverPreconditionerBlockLevel in FVModel

* on the long run, we want to put these things into
  a LinearAlgebra traits class

* only PMFlowTypeTag and FreeFlowTypeTag inherit from the ModelProperties

* include dumux/common/properties.hh
* do not inherit from NumericModel and LinearSolverTypeTag anymore

* Decrease dependencies
* move propertysystem.hh to new folder
* adapt some files

* properties get set in NumericModel now

* bundles the properties NumEqVector, PrimaryVariables,
  SolutionVector, JacobianMatrix, LinearSolverPreconditionerBlockLevel,
  LinearSolverBlockSize and BoundaryTypes