Add more information to these warning messages, including the
declaration for easier identification of the conflicting symbols.
Provides more consistent identifier names for constructors and methods.
Previously constructors did not display the template parameters, whereas
methods did. Incorrect 'renamed from' was also been shown for templated
methods (mmm in new testcase cpp_template_redefine.i).
Named duplicate class template instantiations now issue a warning and are ignored.
Duplicate empty class template instantiations are quietly ignored.
The test cases are fixed for this new behaviour.
This commit is a pre-requisite for the near future so that the Python
builtin wrappers can correctly use the SwigType_namestr function without
generating duplicate symbol names.
William S Fulton