K 10
svn:author
V 6
pepeto
K 8
svn:date
V 27
2010-01-03T23:03:05.531227Z
K 7
svn:log
V 155
Do not simplify the tech tree for advance which need 2 requirements whose one 
is required for the other.

Reported by xiong@sf-id.com

See gna bug #15036

END