Fix overloaded templates and default arguments

The defaultargs attribute was not being correctly set for functions with
default arguments when instantiated with %template.

Closes #529

Examples/test-suite/python/template_default_arg_overloaded_runme.py

@@ -0,0 +1,47 @@
+from template_default_arg_overloaded import *
+
+def check(expected, got):
+  if expected != got:
+    raise RuntimeError("Expected: " + str(expected) + " got: " + str(got))
+
+
+pl = PropertyList()
+check(1, pl.setInt("int", 10))
+check(1, pl.setInt("int", 10, False))
+
+check(2, pl.set("int", pl))
+check(2, pl.set("int", pl, False))
+
+check(3, pl.setInt("int", 10, "int"))
+check(3, pl.setInt("int", 10, "int", False))
+
+
+pl = PropertyListGlobal()
+check(1, pl.setIntGlobal("int", 10))
+check(1, pl.setIntGlobal("int", 10, False))
+
+check(2, pl.set("int", pl))
+check(2, pl.set("int", pl, False))
+
+check(3, pl.setIntGlobal("int", 10, "int"))
+check(3, pl.setIntGlobal("int", 10, "int", False))
+
+
+check(1, GoopIntGlobal(10))
+check(1, GoopIntGlobal(10, True))
+
+check(2, goopGlobal(3))
+check(2, goopGlobal())
+
+check(3, GoopIntGlobal("int", False))
+check(3, GoopIntGlobal("int"))
+
+
+check(1, GoopInt(10))
+check(1, GoopInt(10, True))
+
+check(2, goop(3))
+check(2, goop())
+
+check(3, GoopInt("int", False))
+check(3, GoopInt("int"))