K 10
svn:author
V 5
cazfi
K 8
svn:date
V 27
2007-08-10T21:17:21.593895Z
K 7
svn:log
V 734
Background:
Even though requirement code related functions return boolean,
there is actually three possibilities they can consider:
"yes", "no" and "maybe" (don't know). How to map "maybe" to
boolean value depends on what calling function wants.

Here we added parameter controlling that "maybe" mapping to
many requirement and effect code functions. Calling function
can ask if something is CERTAIN, or if something is POSSIBLE.
In the lowest level this is currently used only when there
is UnitFlag requirement which we cannot check.

Default ruleset visible effect of this is that Sun Tzu's
Academy is no longer marked permanently redundant.
Buildings are marked redundant only if it is CERTAIN that
they have no use.


See #38245

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