[1.4] -Backport from trunk:
- Fix: CMD_CLEAR_ORDER_BACKUP should not be suppressed by pause modes (r26716)
- Fix: Discard incorrectly saved order backups when clients join [FS#6066] (r26700)


git-svn-id: svn://svn.openttd.org@26717 6aa0318a-3be1-0310-93fa-89fd2396df07
[1.4] -Update documentation

git-svn-id: svn://svn.openttd.org@26718 6aa0318a-3be1-0310-93fa-89fd2396df07
-Release: 1.4.2-RC2

git-svn-id: svn://svn.openttd.org@26719 6aa0318a-3be1-0310-93fa-89fd2396df07