Absorb a new version of femebe
Fix out date comment
Use URLs in configuration instead of a token field
Support PostgreSQL 9.0, 9.1

This only works if the error hooks have been backpatched.

No changes to the fields are known to have been made, so merely
accepting a new version string suffices.
Shunt log messages to different endpoints depending on contents

Some messages -- like connection auditing ones -- are uninteresting to
users and they don't want to seem them.

Others, like system internal errors, are interesting (and rare enough)
to not be too voluminous for users but also deserve special treatment
at the audit endpoint.