[Dune] Deprecating begin() and end() in IndexSet

[Oliver Sander]

Dear Dune!
As part of the transition to the GridViews I have marked the methods
begin() and end() in the class IndexSet deprecated.  Unfortunately,
deprecating member templates does not work in any gcc newer than 3.3.
I have filed this as bug 36307.

--
Oliver

-- 
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* Oliver Sander                ** email: sander at mi.fu-berlin.de        *
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