Add some aquifer related stuff to map blocks and columns.
Update CSV
Update df.creature-raws.xml

Added CASTE_TILE flag for caste raws
Some refined guesses at region details array dimensions from mapgen code.

The unk12e8 field is used in deciding whether oceans have soil/sand.
Add information about the meaning of the former unk4 and unk5 arrays.
The 'local_id' of rivers appears to actually be the surface elevation.
Update CSV
Wind strength east/west direction is flipped if this is set to 1
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