[flux][upwind] Include paramGroup when getting the upwindWeight

Closes #809

See merge request !1846

[cleanup] use std::string::empty for better readability

See merge request !1844

Fix/issue 802 inconsistent param lookup

Closes #802

See merge request !1842

Feature/newton unit test

See merge request !1836

This has been forgotten in bug fix commit 61c2158e

[comm] Use new communication headers with Dune 2.7

See merge request !1835

Feature/improve beavers joseph

See merge request !1833

Kilian Weishaupt authored 5 years ago and Ned Coltman committed 5 years ago

* include scvf of velocity dof parallel to boundary
* rename velocityPorousMedium to porousMediumVelocity and return velocity vector
* deprecate old interfaces

* remove previously deprecated interface bjsVelocity
* clean-up includes

Rotationsymmetry: Fix bug to rotate around second axis

See merge request !1832

Fix/clang 10 warnings

See merge request !1830

Clang 10-git warns with this change: class with destructor
marked 'final' cannot be inherited from
[-Wfinal-dtor-non-final-class]

[solidsystem] Implement one component solid system

See merge request !1828

[disc][rotsym] Fix missing includes

See merge request !1829

Fix/subdomain localassemblers

See merge request !1818