Bumped version to 0.2.3.
Merge branch 'master' into dev
Be explicit that version tag should not be used when constructing a control message.
Use the exported constant ERLANG-TERM:+PROTOCOL-VERSION+ instead of defining it again in CLERIC.
Only cleric-test depends on flexi-streams now.
Use and shadow ERLANG-TERM:MAKE-PID and ERLANG-TERM:MAKE-REFERENCE.