evolvecmd: introduce a new module to handle `hg evolve` related code __init__.py is to cluttered with wrapping and all, it's better to move code related to evolve command to new a module which will help us in great refactoring and introducing nice and better flow of data through functions. There is a temporary import cycle is introduced which will be fixed in the series.

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#require test-repo pyflakes

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Copied from Mercurial core (60ee2593a270)

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  $ cd "`dirname "$TESTDIR"`"

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run pyflakes on all tracked files ending in .py or without a file ending

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(skipping binary file random-seed)

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  $ hg locate 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \

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  > | xargs pyflakes 2>/dev/null