* SKIP LOCKED clause for SELECT WITH LOCK, UPDATE and DELETE.
* Misc.
* Change as Dmitry suggested and fix Windows build.
* Change order of LOCK to between SKIP and FIRST.
* Avoid refetch with READ COMMITTED transaction as suggested by Dmitry.
* Revert changes to TRA_wait and use tra_probe in vio/prepare_update
when skipping locked.
* Add to CHANGELOG.
