K 10
svn:author
V 8
sveinung
K 8
svn:date
V 27
2015-05-19T12:48:19.754903Z
K 7
svn:log
V 426
Let rulesets force establish trade route

Allow a ruleset to forbid units from entering the marketplace when a
trade route can be established in stead. That was the behavior before
Enter Marketplace was split from Establish Trade Route.

Should probably be generalized in the future. Had to be done like this so it
could be ready in time for 2.6.

This change doesn't make any bundled ruleset use the support.

See patch #6091
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