dive4elements/river: revision graph

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Added the S-Info collision calculation and chart output2018-06-19, by mschaefer
Added definitions for the S-Info collision workflow and output2018-06-19, by mschaefer
Changed to list of DateRange, added methods in DateRange to support year ranges2018-06-19, by mschaefer
little bugfix on soundings2018-06-14, by gernotbelger

less more | rev 9157: (0) -3000 -1000 -300 -100 -30 -10 -4 +4 +10 +30 +100 +300 tip

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