add rw_lock to client ops
Merge remote-tracking branch 'refs/remotes/kali/feature/rw_lock_client_ops' into develop
Improve error reporting on couch backend design documents access failure (#4994).
Fix typo on tempfile.gettempdir() call.
Merge remote-tracking branch 'refs/remotes/drebs/feature/4994_improve-error-messages-on-client' into develop
Move lock reource to its own file.
Allow sync of large files (~100MB) (#4836).
Add test for syncing many small documents (#4836).
Make couch tests use only one couch instance.