Alba 1.3.25

important : alba.1.3.25 needs arakoon.1.9.22

Bugfixes:

• remove broken objects from cache namespaces (#641)
• add last_updated field for proxy namespace stats (#630)
• update preset propagation state on namespace deletion (#803)
• improvement for hanging deduped osd message delivery (#804)
• fix various space leaks (#808)

Varia:

• dev-edit-config cli addition (#801)
• move toolchain to ocaml.4.04.2 (#805)
• cleanup command for leaked objects (see #774 for details)
• proxy statistics improvements (backport) (#807)
• instrumentation to track space leaks (#808)
• optional fail fast on bad blits (#808)