[Dune] [#540] deprecate intersection iterators on entity

[Dune]

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FS#540 - deprecate intersection iterators on entity
User who did this - Atgeirr Flø Rasmussen (atgeirr)

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Removing them from entities would remove them also from entity pointers and iterators.
Wouldn't this make it harder to access intersections in generic algorithms?

A little example:

template <class EntityIter>
void foo(EntityIter beg, EntityIter end)
{
    for (EntityIter cur = beg; cur != end; ++cur) {
        auto ibeg = cur->ibegin();  // I know, auto is not widely available yet...
        auto iend = cur->iend();
        ... // Code that works on intersections.
    }
}

Above, foo() does not need the grid view.
If only the grid view has ibegin(), we must now pass it as an argument to all such functions.
Also, it is longer to write

    gridview.ibegin(entity);

than

    entity.ibegin();

without any (to me at least) obvious benefits.

Atgeirr

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