cache: introduce an abstract class for cache we can upgrade incrementally Right now each class implements their own mechanism for validation, and update. We start introducing abstract class to ultimately allow more unification of the cache code. The end goal of this series is to introduce a cache for some obsolescence property, not to actually implement the cache. However, taking advantage of adding a new cache to introduce the abstract class seems like a win. This code was headed for core during the 4.3 cycle but never made it there. So we starts with a copy in the evolve repository.

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all: tutorials/tutorial.rst tutorials/topic-tutorial.rst static/logo-evolve.ico

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	sphinx-build . ../html/

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tutorials/tutorial.rst: tutorials/tutorial.t test2rst.py

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	python test2rst.py tutorials/

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tutorials/topic-tutorial.rst: tutorials/topic-tutorial.t test2rst.py

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	python test2rst.py tutorials/

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static/logo-evolve.ico: static/logo-evolve.svg

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	convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico

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