[Matlab] Add missing 'clear' functions

Without these functions, it was impossible to use these classes
without leaking memory. Even with these functions, the memory is
released only when these functions are explicitly called, as
old-style Matlab classes have no notion of a destructor.

Fixes #252.

interfaces/matlab/toolbox/1D/@Domain1D/clear.m

@@ -0,0 +1,9 @@
+function clear(d)
+% CLEAR  Delete the C++ Domain1D object.
+% clear(d)
+% :param d:
+%     Instance of class :mat:func:`Domain1D` (or another
+%     object that derives from Domain1D)
+%
+
+domain_methods(d.dom_id, 10);

interfaces/matlab/toolbox/1D/@Stack/clear.m

@@ -0,0 +1,8 @@
+function clear(s)
+% CLEAR  Delete the C++ Sim1D object.
+% clear(s)
+% :param s:
+%     Instance of class :mat:func:`Stack`
+%
+
+stack_methods(s.stack_id, 110);

interfaces/matlab/toolbox/@Func/clear.m

@@ -0,0 +1,8 @@
+function clear(f)
+% CLEAR  Delete the C++ Func1 object.
+% clear(f)
+% :param f:
+%     Instance of class :mat:func:`Func`
+%
+
+funcmethods(f.index, 1);

interfaces/matlab/toolbox/@Mixture/clear.m

@@ -0,0 +1,8 @@
+function clear(m)
+% CLEAR  Delete the C++ MultiPhase object.
+% clear(m)
+% :param m:
+%     Instance of class :mat:func:`Mixture`
+%
+
+mixturemethods(1, m.mixindex);

interfaces/matlab/toolbox/@ReactorNet/clear.m

@@ -0,0 +1,8 @@
+function clear(n)
+% CLEAR  Delete the C++ ReactorNet object.
+% clear(n)
+% :param n:
+%     Instance of class :mat:func:`ReactorNet`
+%
+
+reactornetmethods(1, n.index);

interfaces/matlab/toolbox/@Wall/clear.m

@@ -0,0 +1,8 @@
+function clear(w)
+% CLEAR  Delete the C++ Wall object.
+% clear(w)
+% :param w:
+%     Instance of class :mat:func:`Wall`
+%
+
+wallmethods(1, w.index);

interfaces/matlab/toolbox/@XML_Node/clear.m

@@ -0,0 +1,8 @@
+function clear(x)
+% CLEAR  Delete the C++ XML_Node object.
+% clear(x)
+% :param x:
+%     Instance of class :mat:func:`XML_Node`
+%
+
+ctmethods(10, 1, x.id);