add API documentation to flowlib (part 2)

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AFCMS 2021-03-28 00:18:19 +01:00
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# flowlib
Simple flow functions.
## flowlib.is_touching()
## flowlib.is_touching(realpos, nodepos, radius)
Return true if a sphere of <radius> at <realpos> collide with node at <nodepos>.
* realpos: position
* nodepos: position
* radius: number
## flowlib.is_water(pos)