[Dune] Id Based Mappers

[S. Swayamjyoti]

Dear Dune,

In the dune-grid how to, we have mappers which are supposed to be
zero-starting and consecutive. Mappers are supposed to have the same
functionality as Index Sets.

But there is also a mention about Id based Mappers. What are these days?
Because these mappers need not have positive or consecutive. Could some one
please give examples to differentiate between Index based mappers and Id
based mappers? I guess they are not same as Index set and Id set.

Regards.
Swayam
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