A number of minor bugs have been dealt with, plus the following more significant changes:
- Added a SYNC slonik command to allow requesting a SYNC event.
This is a more useful thing to wait for than a SUBSCRIBE SET.
- MERGE SET now refuses to be applied if a subscriber has not
yet confirmed post-subscription events
- Added a SLEEP slonik command to allow writing code that tells
the script to pause for some number of seconds
- Fixed a concurrency problem where if you had multiple log
shipped nodes, the threads processing them shared a single
file descriptor as well as other variables.
