[multi-sources-removal] Drop entities.source column Since we remove federated multi-sources support, the same value ('system') is always stored in this column and so could be removed. Also, cleanup repository caches and a few api where the very same useless information could be removed. Closes #2919300, at last [jcr: restore sanity check of etype against schema in checkintegrity.has_eid]

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Add some entities

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As manager, you can access to entity creation forms by using the `site management`_ page.

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.. _`site management`: manage

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As regular user, the index page or the action box may propose some links to create entities according to the context.

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