You now have to write
```
DXTC_has_typedef_initialize_once(Bar);
```
instead of
```
DXTC_has_typedef_initialize_once(Bar)
```
which makes it easier for some tools to digest this piece of code.

refs #4

However, `DynamicVector` does not have `standard_deviation`, so this is
currently disabled.

Merging this now since it's basically functional and we're about to split the repo.

instead default to activate dune-common's