[elliptic-sipdg-discretization] readd current_grid_width()
- without it, compiler complains about pure virtual function
[elliptic-sipdg-discretization] readd current_grid_width()
- without it, compiler complains about pure virtual function
[test.products_boundaryl2/elliptic] fix unsafe conversion warning
[test.products_boundaryl2/elliptic] fix unsafe conversion warning
[test.elliptic-s(w)ipdg-discretization] drop dune-fem dependency
-instead of using Fem::GridWidth::calcGridWidth do calculation locally
[test.elliptic-s(w)ipdg-discretization] calculate grid_width from one entity only
[test.elliptic-s(w)ipdg-discretization] use entity_diameter to calculate grid width
[spaces.interface] add template parameters to SpaceInterface, refs #14
[spaces.tools] add template parameters for SpaceInterface, refs #14
[assembler.local.codim*] add template parameters for SpaceInterface, refs #14
[assembler.system] add template parameters for SpaceInterface, refs #14
[assembler.wrapper] add template parameters for SpaceInterface, refs #14
[discretefunction] add template parameters for SpaceInterface, refs #14
[functionals] add template parameters for SpaceInterface, refs #14
[operators.elliptic-*] add template parameters for SpaceInterface, refs #14
[operators] adapt apply method to SpaceInterface changes, refs #14
[playground.mapper] add template parameters for SpaceInterface, refs #14
[products] add template parameters for SpaceInterface, refs #14
[spaces.cg.base] add template parameters for SpaceInterface, refs #14
[playground.spaces] add template parameters for SpaceInterface, refs #14