Uncompyle6

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- Python 1.4 and 1.5 bug fixes

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- Add rudimentary 1.4 support (still a bit buggy)
- add --tree+ option to show formatting rule, when it is constant
- Python 2.7.15candidate1 support (via `xdis`)
- bug fixes, especially for 3.7 (but 2.7 and 3.6 and others as well)

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- Add some Python 3.7 rules, such as for handling LOAD_METHOD (not complete)
- Fix some fragment bugs
- small doc changes

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- Python 3.x subclass and call parsing fixes
- Allow/note running on Python 3.1
- improve 3.5+ BUILD_MAP_UNPACK
- DRY instruction building code between 2.x and 3.x
- expand testing

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Jesus on Friday's New York Times puzzle: "I'm stuck on 2A"

- fill out 3.5+ BUILD_MAP_UNPACK (more work is needed)
- fill out 3.4+ CALL_FUNCTION_... (more work is needed)
- fill out 3.5 MAKE_FUNCTION (more work is needed)
- reduce 3.5, 3.6 control-flow bugs
- reduce ambiguity in rules that lead to long (exponential?) parses
- limit/isolate some 2.6/2.7,3.x grammar rules
- more run-time testing of decompiled code
- more removal of parenthesis around calls via setting precedence

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- Add code_deparse_with_offset() fragment function.
- Correct parameter call fragment deparse_code()
- Lots of 3.6, 3.x, and 2.7 bug fixes
About 5% of 3.6 fail parsing now. But
semantics still needs much to be desired.