[Dune] what is a const template parameter?

[Aleksejs Fomins]

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Dear Dune,

Another quick question. When GeomGrid accesses the traits of a
geometry from another class, for example, the entity class, it says
sth like

typedef typename remove_const< Grid >::type::Traits Traits;

The entity is given in EntityPointerTraits as

Dune::Entity< codimension, dimension, const Grid, GeoGrid::Entity >
Entity;


Why would one prefer to use a const template parameter? In my
ignorance I never even knew this was possible before I saw it here.

Thanks
Aleksejs
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