Adds support for running multiple redundant Openfire servers together in a cluster.

Note for developers, on 29 October 2020 this repository was rewritten to remove legacy and unrelated Openfire commit history. See forums post for more details. This repository was susquently rewritten again on 1 December 2020 to remove and additional bad commit circa 2013.

Issues may be reported to the forums or via this repo's Github Issues.