Release 7.x-2.0-rc4
Changes since 7.x-2.0-rc3:
* #2379871 by dobe, morbiD, axel.rutz: Improve indexes and queries.
* #2552573: Fix index sizes by changing column sizes.
* #2379871: White Screen of Death on admin/config
* Remove array_replace_recursive() fallback implementation
* #2559429 by vurt, Chewits, klapper: Private file system is not compatible
with Ultimate Cron
* #2733797 by Chris Charlton: Help text: Retain X amount of log entries