Fixed EitherPrerequisites (optional prerequisites) in advance.txt. A maximum of 4 (prerequisites + eitherprerequisites) can be used per advance. e.g. Writing can lead to 4 other advances, as a prerequisite or eitherprerequisite. And e.g. Trade can only have 4 required advances (prerequities + eitherprerequisites). As far as I know this is just a limitation of the great library tech tree tab height, so could possibly be increased.
modified trunk/ctp2_code/gs/gameobj/Advances.cpp
modified trunk/ctp2_code/gs/gameobj/Advances.cpp
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