- code from JSONExpression::esc(char val, ...) moved to Pikotools (convert/misc.h)

- added ModelContainerWrapper::set_iterator_at_first_model() method

src/modelcontainerwrapper.h

@@ -69,6 +69,9 @@ public:
 		return false;
 	}
 
+	virtual void set_iterator_at_first_model()
+	{
+	}
 };
 
 
@@ -106,6 +109,10 @@ public:
 		return iterator != container->end();
 	}
 
+	void set_iterator_at_first_model()
+	{
+		iterator = container->begin();
+	}
 
 
 protected: