update version number

5.10.0 is a better version for these changes

bump v numbers

update opam ver

CHANGES

CHANGES and version bump

Merge branch 'master' into prepare-lwt6-release

* master:
  set_tcp_nodelay absorbs EOPNOTSUPP when not explicitely set

add version numbers

set version to 6beta0

better encapsulation of multidomain-sync internals