Feature/improve extract line data

See merge request !2207

* Make make dir of output dir more consise and handle "  " case
* simplify verbose output

Feature/staggered assembler fix forwarding implicit flag

See merge request !2206

When multiple vtk files were given as arguments to the script together
with a base name for the output .csv files, a single csv file was
created that contained the data of the last given vtk file. This commit
adds an index to the file names in case multiple vtk files are provided.

[rans][fluxvars] adapt coefficient averaging with boundary check

See merge request !2204

Feature/cc internaldirichlet

Closes #772

See merge request !2202

* rename and deprecated function updateBoundary -> updateDirichletConstraints

New concept for extrusion of grid geometries

See merge request !2188

Translate install script to Python

See merge request !2150

[geometry] Add header for distance helper functions

See merge request !2192