[RP] defprefixcmd patch

[Pasi Kallinen]

Hi,

this small patch adds a new command "defprefixcmd", which will allow
the user to set up a command that is executed when the prefix key is
pressed.
Eg. "defprefixcmd curframe" would show the current frame.

http://cs.joensuu.fi/~pkalli/code/rp-defprefixcmd.diff

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Pasi Kallinen        |"That's what the boys are there for." -Hitler
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