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- fixed full upwdining: only use satCond for weighting
- re-implemented option to disable weights in skeleton term
- moved experimental settings function to Operator namespace

- add CMake option 'EXPERIMENTAL_DG_FEATURES'
- add cpp definition EXPERIMENTAL_DG_FEATURES
- add optional config keys 'dg.method' and 'dg.upwinding'

The upwind numeric flux already contains the upwind conductivity factor

For no upwinding, the harmonic average of theconductivity factors is computed.

**Note: This only affects the skeleton not the boundary term!**
Upwinding can now be turned off (`none`)
or set to full upwinding (`fullUpwind`).
Removed 'weights' option.

New options are OOP (no penalty term) and IIP (no symmetry term)
Also adapted error estimator (for OOP scheme)
Moved error estimator into Operator namespace
Changed initialization orders in both operators to suppress warnings

Time parameter has to be the conclusion time of the last time step.

[ci skip] because this branch has the old testing scheme

The time variable was unused, which caused the builds to fail.

(cherry picked from commit e1bb918c)

The time variable was unused, which caused the builds to fail.

Multiply relative conductivity to numeric flux now.
Add it also to the evaporation estimation.

Unquaring must occur outside the error indicator because summation
occurs over multiple intersections.

FlowBoundary and time now need to be passed to the error indicator.

Error indicator now does not contain squares anymore.
Removed VTK output of error estimators.
Removed all unused variables inside the estimator.

changed newest adaptation scheme to skeleton term proposed by diPietro and Ern. writing this and old error residuals into extra vtk files

tests are allowed to fail until they are adapted.
'deploy' stage only contains building the docs.

see #5

fixes #31

Revert "rolled back to requirements.txt files for supporting reinstallation of the dorie python modules"

This reverts commit b314fbc6.

* updated requirement list
* added optional package list
* reworked manual installation
* warning not to call 'make install' #16
* notes on parallel setup requirements #24