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.

This module lets you block connections to remote servers at the s2s
level.

``` {.lua}
s2s_blacklist = {
    "proxy.eu.jabber.org",
}
```