make nodes to provide nodes instead of mixins

include/nodes/ComplexNode.h

@@ -6,7 +6,7 @@
 #include "Logger.h"
 
 class ComplexNode : public BaseNode,
-		    virtual public HierarchicalLinkMixin {
+		    virtual public HierarchicalLinkMixin<INode> {
 public:
 	~ComplexNode() {
 		Logger::get("Node").dbg(std::string("--- Complex destructor called for: ") + name_);

include/nodes/SimpleNode.h

@@ -7,7 +7,7 @@
 #include "Logger.h"
 
 class SimpleNode : public BaseNode,
-		   virtual public LazyLinkMixin<OneToOneLink<ILinkMixin>> {
+		   virtual public LazyLinkMixin<OneToOneLink<INode>> {
 public:
 	~SimpleNode() {
 		Logger::get("Node").dbg(std::string("--- Simple destructor called for: ") + name_);