Uncompyle6

- support for Python 2.3 added
- use the marshal and disassembly code from their respective python
versions, so that decompyle can manipulate bytecode independently
of the interpreter that runs decompyle itself (for example it can
decompile python2.3 bytecode even when running under python2.2)

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- Require `spark_parser` >= 1.1.0

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- Support single-mode (in addition to exec-mode) compilation
- Start to DRY Python 2 and Python 3 grammars
- Fix bug in if else ternary construct
- Fix bug in uncomplye6 `-d` and `-r` options (via lelicopter)

- support for Python 1.5 up to Python 2.2
- no longer requires to be run with the Python interpreter version
which generated the byte-code.
- requires Python 2.2
- pretty-prints docstrings, hashes, lists and tuples
- decompyle is now a script and a package
- added emacs mode-hint and tab-width for each file output
- enhanced test suite: more test patterns, .pyc/.pyo included
- avoids unnecessary 'global' statements
- still untested: EXTENDED_ARG

internal changes:
- major code overhoul: splitted into several modules, clean-ups
- use a list of valid magics instead of the single one from imp.py
- uses copies of 'dis.py' for every supported version. This ensures
correct disassemling of the byte-code.
- use a single Walker and a single Parser, thus saving time and memory
- use augmented assign and 'print >>' internally
- optimized 'Walker.engine', the main part of code generation

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- Limited support for decompiling Python 3.5
- Improve Python 3 class deparsing
- Handle `MAKE_CLOSURE` opcode
- Start to DRY opcode code.
- increase test coverage
- fix misc small bugs and some improvements

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- Fix cross-version Marshal loading
- Handle Python 3.3 . dotted class names
- Limited 3.5 support: allows deparsing other versions
- Refactor code more, misc bug fixes