LocalFunctionGeometry offers a different interface than Parametrized- and CurvedGeometry

I noticed that the methods const LocalGeometry& localGeometry () const,

const FlatGeometry& flatGeometry () const,

const HostGeometry& hostGeometry () const are private in LocalFunctionGeometry but public or nonexistent in the two other geometries.

I happen to have a (maybe rare) application where these methods are very useful and would thus ask to make them public consistently. !21 make the LocalFunctionGeometrys emthods public