K 10
svn:author
V 6
pepeto
K 8
svn:date
V 27
2014-10-23T20:40:00.335899Z
K 7
svn:log
V 467
Make research_invention_reachable() call cost not exponential with deep
technology trees using root advances (e.g. experimental ruleset).

Remove the hack when loading the ruleset consisting to propagate the root of
an advance to its children, because one technology may have many parents-root.
The test in research_invention_reachable() should now handle this case
correctly.

Report and original patch by aloril _PLUS_ freeciv _AT_ iki _DOT_ fi

See gna patch #5357
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