Metapensiero-extjs-desktop

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* Require the Versio package only as a ``dev`` extra

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* Fix default path of the version.txt file in the version bumper tool

* Do not scan the extjs_deps module as it does not contain anything
useful for venusian/pyramid

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* Fix minor glitch

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* Fix ExtJS download script

* Explicitly state that the package needs to be expanded on disk

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* Allow changing lookup datasets when specified as arrays

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* Add a few options to the ExtJS downloader script