cylc/cylc — pull request #628 by hjoliver (2013-08-13 02:37:21+00:00)
Title: Enhanced the broadcast command.

1) Provided an interface to the broadcast expire method.
2) Allowed clearing broadcasts by cycle time or namespace.
3) Rewrote the command help.

In response to an email from @dpmatthews - Dave, please review. Easy to test with a held suite.