[multi-sources-removal] Drop pyrorql and zmqrql sources After a few years experementing "true" multi-sources, we're now moving to "copy-based" source à la datafeed. As pyro and zmq sources have no more known customers and the related code is in the way of future refactoring of cubicweb's core, we decided to drop support for those sources without backward compatibility. If you're still using a zmqrql or pyrorql source and you want to upgrade, ask support to move it to datafeed using a pre-3.19 version first. Related to #2919300 (first step)

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action box

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    Area visible in the upper left column. You have a list of available actions on the entity. The most frequently used entry is `modify`.

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object

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    All element created in the application

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    Example: project, ticket, user, ...

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relation editing module

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    HTML widget that let you define new relations amongst objects.

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relation

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    It's a kind of 'smart' link between 2 objets of the application. It has a specific sense that determine dynamic behaviour and add a new logic of the content.

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