* Adds whitespaces before and after code blocks
* Removes some superfluous white space in code blocks
* Some small changes regarding header guards and formatting

Feature/modify python examples docgen

See merge request !1915

[cleanup] remove solidsystem from modeltraits

See merge request !1913

[readme] Add new paper and section "how to cite"

Closes #842

See merge request !1909

[git] Amend mailmap to contain actual mapping entries

See merge request !1911

Feature/istl paramtree

See merge request !1904

[nonequilibrium][localresidual] Assert that numPhases > 1 and clean up

Closes #836

See merge request !1900

Kilian Weishaupt authored 5 years ago and Timo Koch committed 5 years ago

* use computeFlux of parent class

Kilian Weishaupt authored 5 years ago and Timo Koch committed 5 years ago

* remove unused code and wrong comments
* add constexpr if

[cleanup] remove deprecation warnings from 3.1 and older

See merge request !1903

Improve effective laws

Closes #711, #710, and #733

See merge request !1684

[doc] Advertise [[deprecated(msg)]] instead of old Dune macro

See merge request !1908

[contributionguide] Description of backwards compatibility policy

Closes #818

See merge request !1906

Timo Koch authored 5 years ago and Ned Coltman committed 5 years ago

FluidSystem::getMainComponent returns the main componet index of the phase.
This doesn't actually make sense for the tracer models which why this commit also
* removes getMainComponent for tracer fluid systems (Changelog amended)
* guards all occurences of getMainComponent in code that works for tracer too
with constexpr if