Obs_storage: fix memleak related to locks (lock names kept in table).
Compile with -bin-annot on OCaml >= 4.00.1.
Prevent non-principal type warning.
Added .merlin file.
Record the number of transactions in the load stats.
Remove the repl code that depended (conditionally) on lwt.text.
Fix transaction scoping in REPL.
Implement new transaction_id operation (TXID in REPL).
Log mutex locking/unlocking in Obs_storage.
Update extprot submodule.
Set log format used by obigstore server.
Update extprot submodule.
Small tweaks in Obs_protocol_server logging.
Improve Obs_storage mutex operation logging.
Rework logging in Obs_protocol_server, using different sections.
Prevent stack overflow in lock weaktbl cleanup in Obs_storage.
Fix minor typo (& -> &&) that causes deprecated feature warning on 4.01.
Do not use fsync (i.e., open DB in "unsafe mode") in tests.
Build with lwt.syntax.log syntax extension. Large speed boost in req processing.