[facet][box] do not use support points for coupling fluxes

See merge request !1688

This reverts changes introduced in
aa5951f5 and the following commits.
It turned out that doing the flux computation on the basis of a support
point inside the cell and then a tpfa flux towards the facet elements
performed very bad for anisotropic tensors.

Use entity.type() instead of creating a temporary geometry

See merge request !1686

Constructing a geometry may be expensive depending on the grid
implementation.

[readme] Fix coverage link

See merge request !1685

Feature/add hint to disable prop macro warning

See merge request !1679

[cleanup] Replace depr prop macros by GetPropType traits

See merge request !1678

[readme] Add coverage info

See merge request !1681

[cmake][test] Increase timeout to be able to test in debug mode

See merge request !1680

[stokesdarcy][couplingdata] Fix deprecation warning

See merge request !1677

[staggered][scvf] Adapt geometry and corner storage

See merge request !1546

Update README.md with doc section

See merge request !1676

Cleanup/poromechanics

See merge request !1675

[io][vtkfunction] return copy of shared ptr

See merge request !1674

Feature/gmsh boundary flag for alugrid

See merge request !1672

The boudnary segment index flag is the default except if it's
overwritten for a specfific grid. This is currently done in ALU which
per default only works with DGF boundary flags.

Samuel Scherrer authored Jul 17, 2019 and Timo Koch committed Jul 25, 2019

For gmsh we always want the intersection.boundarySegmentIndex as a
boundary flag, while for DGF file Alu grid needs to use the non-standard
intersection.impl().boundaryId().

[logginParameterTree] Exclude "ParamFile" from unused params

Closes #738

See merge request !1673

Merge branch '721-navier-stokes-revise-definition-of-transporting-velocity-on-boundary-for-momentum-upwinding' into 'master'

[Navier-Stokes] Revise definition of transporting velocity on boundary for momentum upwinding.

Closes #721

See merge request !1650