Rework LLSurface[Patch]. Abuse weak_ptr for now. Rewrote connectNeighbor. LLSurfacePatch no longer calls parent LLSurface with this poiter, instead parent surface just handles return value and controls its own behavior [Requred for weak_ptr/shared_ptr change.

indra/newview/llworld.cpp

@@ -673,7 +673,7 @@ LLSurfacePatch * LLWorld::resolveLandPatchGlobal(const LLVector3d &pos_global)
 		return NULL;
 	}
 
-	return regionp->getLand().resolvePatchGlobal(pos_global);
+	return regionp->getLand().resolvePatchGlobal(pos_global).get();
 }