[multidomain][stokesdarcy] Improve docu and structure of coupling indices

See merge request !1126

[material][1padapter] Make usable for immiscible fluidsystems

See merge request !1129

Kilian Weishaupt authored 6 years ago and Timo Koch committed 6 years ago

* choose correct number of compoments based on whether MultiPhaseFluidSystem
  is immiscible or not

* use helper struct instead of enable_if

[properties] improve the output of the type/property tag tree

See merge request !1120

[1p_1p] Ignore temporary grid files

See merge request !1121

[1pnc] Remove unused private variable

See merge request !1128

* porosity_ not used anywhere

Added PNG/dalton1.png and PNG/dalton2.png to the list of files for building the handbook.

See merge request !1127

Fix/remove phase idx

Closes #529

See merge request !1125

[richardsNC] Remove fluidsystemPhaseIdx

See merge request !1123

Free vtkoutputmodule from TypeTag

See merge request !1113

* use template specialization to deprecate old interface
* phaseIdx cannot be used anymore due to the variadic template
  template<class ...Dummy>
  class VtkOutputmodule

[material][brineair] Use switch instead of static constexpr array

See merge request !1124

* fixes linker error on c++14

[rans] Rename elementId to elementIdx

See merge request !1055

[freeflow] Remove PhaseIdx and fluidsystemPhaseIdx

See merge request !1118