Log Message:
7kaa: Update to 2.15.6

Seven Kingdoms v2.15.6

   Here it is! A release long in the making, which tackles issues with the
   AI, such as smarter management, continuing assaults, and actually going on
   sea based missions. Perhaps the AI will no longer be as easily tricked.

   There has been some more quality of code improvements and testing to
   ensure stability. Thanks to all the testers the past few weeks. Now on to
   the next round of improvements. :)