- Update to 0.9.12.1

- In case a lot of message were being processed, the heartbeat timer
  could be delayed for a long period of time.
- The old scheduler algorithm could be unfair when certain message priority
  were not available for processing. We now appropriatly handle repartition
  to others priority messages.
- Message of the same priority could be processed in the wrong order when
  on-disk buffers were used.
- No integrity check were performed on orphan on-disk buffer in case of an
  operating system crash. By using the prelude-failover API, we can now
  detect possibly corrupted disk buffer, or resume at the time we stopped
  recovering them.
- New sched-priority and sched-buffer-size configuration options. 
- Fix a bug where several relaying plugin instance would only forward
  their message to a single Manager.
- Use libev in place of the server-logic architecture: libev provides
  the most scalable event notification mechanism available on a given
  operating system.
- New connection-timeout option, governing the maximum number of
  seconds a client might take to authenticate (default: 10 seconds).
- Fix a possible file descriptor leak on connection closure error.
- Massive cleanup of the build process, enable RELRO when possible.
- Fix a number of potential race in the reverse relaying code.
- When reverse relaying messages, encode the same message once for all
  recipients: this improve performance with more than one reverse
  relaying client (was a long time FIXME).
- Libev introduction also fix a rare issue where server-logic would not
  notice a dead connection.
- Update libev, and GnuLib code.

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