Update symbols.txt

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Oliver Schmidt 2018-05-25 14:48:20 +02:00 committed by GitHub
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Source: The Hitchhiker's Guide To GEOS
http://lyonlabs.org/commodore/onrequest/geos-manuals/The_Hitchhikers_Guide_to_GEOS.pdf
https://archive.org/details/The_Hitchhikers_Guide_to_GEOS
GEOS Variables