[freeflow] Add estimation of omega inflow BC value

See merge request !499

Fix/documentation

See merge request !485

Some links were outdated/not working.

[io][gnuplotinterface] Fix forgotten and related tests

See merge request !482

[io][gnuplotinterface] Fix issue with outputDirectory for interactive plot

See merge request !480

[io][gnuplotinterface] Fix signature for forwarded plot function and deprecation

See merge request !479

Fix deprecation of plot(), thanks Timo for the heads-up.

[doc] Fix "coefficent" typo

See merge request !468

[Readme] Reference dumux logo

See merge request !474

[freeflow] Add files for estimating the properties of a turbulence flow

See merge request !463

[gnuplotinterface] Various improvements

See merge request !471

* enable dashed lines via useDashedLines
* .gp only if specified
* use C++ function for converting to string
* cleanup

[dumux][cleanup] Remove deprecation warnings

See merge request !460

[fluidsystems][h2oair] Implement relative humidity

See merge request !464

Bump version 2.12-git

See merge request !465

[2cstokes2p2c] Provide possibility to use molar based formulation for coupled problems

See merge request !462

[dumuxmessage] Cleanup start message the current master isn't the birthday edition anymore

See merge request !461

fix CHANGELOG.md

See merge request !459

[fix] Remove superfluous semicolons

See merge request !457

Update CHANGELOG.md

See merge request !441