Imported MyBB 1.6.14

This is https://github.com/mybb/mybb/releases/tag/mybb_1614 but
emcom expects the file structure from the release download i.e.
Documentation and Upload, so this is the download.
Added config.php
Added local files and plugins
Patch moderator-canonlyviewownthreads-fix
Patch disable-reputation-display
Added install lock
Rename admin -> _admin
Added settings.php
Added some language files