mod_default_bookmarks: Abort on incompatible mod_bookmarks The module formerly known as mod_bookmarks exposed this publish_to_pep function, while the new mod_bookmarks2 (called mod_bookmarks in trunk) does not.

This module lets you block connections to any remote servers not on a
whitelist.

``` {.lua}
s2s_whitelist = {
    "example.org",
}
```