[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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.. role:: raw-html(raw)

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   :format: html

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RSS driven

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----------

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RSS is a pretty useful technology that can be widely used on this

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site. Any set of data can be presented as RSS. You can then plug in

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an RSS reader into that and follow the site activity. For example :

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:raw-html:`<p><a class="reference"

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href="view?vid=rss&amp;rql=Any+X%2CM+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30"><img

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alt="rss" src="data/rss.png"> latest changes</a></p>`