add API documentation to flowlib (part 2)
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# flowlib
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Simple flow functions.
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## flowlib.is_touching()
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## flowlib.is_touching(realpos, nodepos, radius)
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Return true if a sphere of <radius> at <realpos> collide with node at <nodepos>.
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* realpos: position
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* nodepos: position
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* radius: number
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## flowlib.is_water(pos)
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