dmeventd -R updates

Hi!

As requested by Milan in BZ 454618:

- dmeventd -R will continue to start up even if no dmeventd is currently running; I have added a test for this behaviour
- add -R to dmeventd manpage

Petr

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id' Ash = Ash; id' Dust = Dust; id' _ = undefined

it was not only me, I just transcribed irc chat:-)

Anyway, Ack,

Milan