[spaces] moved finitevolume -> fv
[playground.spaces] namespace FiniteVolume -> FV, update header guards, refs #14
[spaces] moved RaviartThomas -> RT, refs #14
[spaces.dg.pdelab] moved DiscontinuousLangrange -> DG, refs #14
[spaces.dg.fem] moved DiscontinuousLangrange -> DG, refs #14
[spaces.dg.femlocalfunctions] moved DiscontinuousLangrange -> DG, refs #14
[playground.spaces.cg.fem-localfunctions] moved ContinousLagrange -> CG
[playground.spaces.dg.fem-localfunctions] fix typo
[spaces] moved ContinuousLagrange -> CG, refs #14
[spaces] moved ContinuousLagrange -> CG, refs #14
[test] fix includes and namespaces, refs #14
[operators] fix includes and namespaces, refs #14
[playground.spaces.dg] fix typos
[spaces.cg.base] copy from continuouslagrange/base.hh
[spaces] fix includes and namespaces, refs #14
[spaces.interface] remove disable warnings
[spaces] moved continuouslagrange.hh -> cg.hh
[spaces] moved discontinuouslagrange.hh -> dg.hh
[spaces] deprecate (dis)continuouslagrange.hh
[test.operators_elliptic_swipdg] fix include