#1 Duplicating overloaded methods fails

[Thomas Roka-Aardal]

When a class or interface defines overloaded methods (methods with
different arguments, but with the same name), the duplication fails. This
needs fixing urgently, and a testcase for regression should be added.

[Thomas Roka-Aardal]

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The duplication does not take into account overloaded methods, it merely
attempts to create a setup_getStuff method for both getStuff() and getStuff
(String). This needs to be changed, not sure about how yet, and the attribute,
attribute length and exception state fields need to be renamed to reflect which
method they are keeping state for.

[Thomas Roka-Aardal]

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Fixed bug by using renamed methods in the duplicate class. Now the duplicate
classes have methods with argument hints in them, e.g. "getStuff_String_int()"
etc.