dive4elements/river: revision graph

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DC: Flatten bed height diff tree a bit.2014-06-20, by Sascha L. Teichmann
DC: Group bedheight diffs by both years.2014-06-20, by Sascha L. Teichmann
merged.2014-06-20, by Raimund Renkert
New macros for bed height differneces.2014-06-20, by Raimund Renkert

less more | rev 7964: (0) -3000 -1000 -300 -100 -30 -10 -4 +4 +10 +30 +100 +300 +1000 tip

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