Fix/bjs velocity calculation

See merge request !1798

[doc] Improve example readme

See merge request !1809

[stokesDarcy][couplingData] Generalize pressure reconstruction

See merge request !1565

[examples] update readmes according to fvGridGeometry changes

See merge request !1808

[2p2c] add asImp_ for call of getFlux

See merge request !1794

FVGridGeometry and fvGridGeometry were renamed to GridGeometry and 
gridGeometry respectively. This updates the readmes for the examples.

[rotationsymmetry] Add convenience traits to construct radially symmetric grid geometries

See merge request !1804

[pointsource] Make computation more efficient by not copying vector

See merge request !1805

Feature/radially symmetric problems

See merge request !1803

This implements wrappers for scvs and scvf that turn them into
radially symmetric counterparts by overloading the volume() and
area() functions. We support three modes:

* disc (annulus): A 1d grid is extruded into an annulus or disc
In the case of a disc (inner pos: 0) the inner scvf.area() is 0!

* ball (shell): A 1d grid is extruded into a spherical shell or a ball
In the case of a ball the inner scvf.area() is 0!

* toroid: A 2d grid is extruded into a toroid
In the case that on grid side is aligned with the axis the inner
scvf.area() for all inner scvfs is 0!
The grid points all have to be >= 0!
We also support unstructured grids and random convex shapes

Fix/tracer velocity

Closes #782

See merge request !1786

Simon Scholz authored Oct 31, 2019 and Timo Koch committed Nov 20, 2019

This uses the newly introduced fluxtraits to check if the velocity field
is stationary.
With these changes the velocity output is corrected in the reference
solution.

[doc] Correct typos in comments

See merge request !1800

[mpnc][volVars] Make Indices typedef public

See merge request !1777

Fix/stdmove and unused variables

See merge request !1799

Fix/error message gridgeometry parallel box

Closes #786

See merge request !1795

[test][stokes2d] Produces output files with unique name

Closes #783

See merge request !1790

[bugfix][staggered] Use value member of true/false_type

See merge request !1783

[cakegridmanager] Fix bugs, allow zero well radius

See merge request !1785