Python 3.1 EXTENDED arg, funcdef and function annotations

[rocky]

The following program niether disassembles properly nor decompiles properly.

# An example of Python 3.1 funkiness
# Disassembling this gives the "EXTENDED_ARG" op

def open(file, mode = "r", buffering = None,
         encoding = None, errors = None,
         newline = None, closefd = True) -> "IOBase":
    return text

I think this all has to do with Python 3.x function annotations.

(If it is any consolation, the above was just fixed in xdis disassembly and I still have decompilation to fix up.)