obsolete: introduce an extension helper and use it this extension helper allow most of setup operation to be declared in place using decorator. This allow clear separation between independant part of the code. This is the first HUGE wave of changes related to this introduction. The goal is to have a clear distinction and documention of every part of this extension.

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syntax: re

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/figures/[^/]+\.png$

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^docs/build/

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^docs/html/

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^html/

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\.pyc$

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~$

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\.swp$

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\.orig$

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\.rej$

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\.err$

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^tests/easy_run.sh$