Merge pull request #244 from jnugent/master

*8823* submodule changes track ##jnugent/master##
*8787* Fix test race conditions; make timing use const
*8853* Add explicit string cast to avoid problematic DB cast
*8746* Remove admin user group path in upgrade
Submodule update
*8854* Add config variable for X_FORWARDED_FOR
*8854* Submodule update
Submodule commit
*8812* Correct OMP-specific lingo
*8825* Initial plugin gallery work
*8825* Make tab name meaningful
*8825* Submodule update ##asmecher/8825-fix##
Merge pull request #261 from asmecher/8825-fix

*8825* Implement plugin gallery
*8825* Submodule update
*8630* Forward-port reviewer no files warning to OJS master
*8630* Submodule update
*8630* Submodule update
*8630* Submodule update
*8707* Submodule update