Replace propertysystem macros

See merge request !1296

[test][el1p] Replace deprecated IOFields::init with initOutputModule

See merge request !1297

Feature/md explicit assembler

Closes #521

See merge request !1288

[fix][mpfa][fvgridgeom] rearrange public aliases

Closes #597

See merge request !1293

[nonequilibrium] fix typo in volume variables

See merge request !1295

Apparently, this isn't tested.

[fix][multidomain] linker error with c++14

See merge request !1294

This is necessary for the upwind scheme in facet coupling models, as
the upwind/downwind volume variables type can be from the other domain.

The code in the implementation is basically just a copy
of the ccexplicitlocalassembler. The only difference is
how the current solution is obtained.
TODO: can we reuse code here?