Write the mean of a UCT node as well

git-svn-id: svn://svn.code.sf.net/p/fuego/code/trunk@1903 2e953b5c-c64d-0410-be54-f773e93e544c
Begin implementing GoSafetySolver::PotentialCaptureMove

git-svn-id: svn://svn.code.sf.net/p/fuego/code/trunk@1904 2e953b5c-c64d-0410-be54-f773e93e544c
Improve move filter in and near the corner

git-svn-id: svn://svn.code.sf.net/p/fuego/code/trunk@1905 2e953b5c-c64d-0410-be54-f773e93e544c
Filter more alternating safe points

git-svn-id: svn://svn.code.sf.net/p/fuego/code/trunk@1906 2e953b5c-c64d-0410-be54-f773e93e544c