dive4elements/river: revision graph

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FixA: Extent of overview is determined by min/max km of sectors.2012-06-20, by Sascha L. Teichmann
Removed superfluous import.2012-06-20, by Sascha L. Teichmann
Fix zoom/export issue665, issue459, issue667.2012-06-20, by Felix Wolfsteller
Added missing StyleHelper class from last commit.2012-06-18, by Ingo Weinzierl

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