Pyseq

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* Performance improvements
* Deprecates support for Python 2
* Adds %H human readable size directive
* Removes debug logging

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* Addresses issue 69 (strict padding)
* Disables pad strictness by default

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* Fixes issue 67 (hangs on many missing frames)

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* Removes deprecation warnings

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* Fixes setup issues for python 2.7

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* Fixes bug where changes in frame size (e.g. 9 to 10) cause incorrect pad

* Disables strict padding in lss by default (adds --strict option)