Improved template template parameters support.

Previously, specifying more than one simple template template parameter
resulted in a parse error. Now multiple template template parameters are
working including instantiation with %template. Example:

  template <template<template<class> class, class> class Op, template<class> class X, class Y>
    class C { ... };

Closes #624
Closes #1021

Examples/test-suite/python/template_template_parameters_runme.py

@@ -1,6 +1,6 @@
 from template_template_parameters import *
 
-# Test first part
+# Test part 1
 listBool = ListFastBool()
 listBool.item = True
 x_boolean = listBool.allotype
@@ -13,7 +13,7 @@ x_double = listDouble.allotype
 if listDouble.item != 10.2:
   raise RuntimeError("Failed")
 
-# Test second part
+# Test part 2
 floatTestStruct = FloatTestStruct()
 floatContainer2 = floatTestStruct.x
 floatContainer2.x = 8.1
@@ -28,3 +28,6 @@ intTestStructReturned = TestStructContainer1Method(intTestStruct)
 if intTestStructReturned.x.x != 101:
   raise RuntimeError("Failed")
 
+# Test part 3
+mfi99 = MyFootInt99()
+mfi99 += mfi99 # __iadd__