"forest_clearing" room generator will floodfill to ensure are are no 1x1 spots...

"forest_clearing" room generator will floodfill to ensure are are no 1x1 spots insolated from the map


git-svn-id: http://svn.net-core.org/repos/t-engine4@2347 51575b47-30f0-44d4-a5cc-537603b46e54