Added `RT03DLocalFniteElement` to `dune/functions/functionspacebases/raviartthomasbasis.hh`

Henrik Stolzmannrequested to merge
henrik.stolzmann/dune-functions:simplexHardcodeLFE into master

See MR core/dune-localfunctions!172 (merged)

And added tests for various combinations of dim,order for simplex or cube grids.

Edited by Henrik Stolzmann

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