TreeList::FlushCache() fix

git-svn-id: http://farmanager.com/svn/trunk@10324 72235d2c-c60c-0410-a47a-a0032694dc5d
TreeList::FlushCache() moved to avoid blocking

git-svn-id: http://farmanager.com/svn/trunk@10326 72235d2c-c60c-0410-a47a-a0032694dc5d