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mod_pep_atom_categories: Add a module to index categories in Atom entries A new node is created for each category, named category-<the category>, which contains a list of all node/item tuples having said category as a tag.

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summary: Allow server administrators to probe any user
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This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.