Add test case for attributes with moderately complex templates

* New test case tests that %attribute macros correctly supports passing
  template with multiple parameters as class name or attribute type name

* Some further changes were made to %attribute macros - now
  AttributeType is protected with %arg as well. This allows you
  to have attributes of type e.g. std::pair<int,int> etc

Update CHANGES file for %attribute template fixes

Closes #48

Examples/test-suite/python/li_attribute_template_runme.py

@@ -0,0 +1,67 @@
+# Check usage of template attributes
+
+import li_attribute_template
+
+chell = li_attribute_template.Cintint(1,2,3)
+
+def rassert( what, master ):
+    if what != master:
+        print what
+        raise RuntimeError
+
+## Testing primitive by value attribute
+rassert( chell.a, 1 )
+
+chell.a = 3
+rassert( chell.a, 3 )
+
+## Testing primitive by ref attribute
+
+rassert( chell.b, 2 )
+
+chell.b = 5
+rassert( chell.b,5 )
+
+## Testing string
+chell.str = "abc"
+rassert( chell.str, "abc" )
+
+# Testing class by value
+
+rassert( chell.d.value, 1 )
+
+chell.d = li_attribute_template.Foo(2)
+rassert( chell.d.value, 2 )
+
+# Testing class by reference
+
+rassert( chell.e.value, 2 )
+
+chell.e= li_attribute_template.Foo(3)
+rassert( chell.e.value, 3 )
+
+chell.e.value = 4
+rassert( chell.e.value, 4 )
+
+# Testing moderately complex template by value
+rassert( chell.f.first, 1 )
+rassert( chell.f.second, 2 )
+
+pair = li_attribute_template.pair_intint(3,4)
+chell.f = pair
+rassert( chell.f.first, 3 )
+rassert( chell.f.second, 4 )
+
+# Testing moderately complex template by ref
+rassert( chell.g.first, 2 )
+rassert( chell.g.second, 3 )
+
+pair = li_attribute_template.pair_intint(4,5)
+chell.g = pair
+rassert( chell.g.first, 4 )
+rassert( chell.g.second, 5 )
+
+chell.g.first = 6
+chell.g.second = 7
+rassert( chell.g.first, 6 )
+rassert( chell.g.second, 7 )