netatalk and dummy patch for 2.1.29

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here's a patch that i've sent to alan that didn't get into 2.1.30. i thought it might be useful for other people as well. it's to 2.1.29, but it should work without much difficulty in 2.1.30 as well.

what it does:

• adds multicast to the dummy module's nefarious capabilities. i did this so that i could test out appletalk on my unconnected machine.
• fixes ddp.c so that you can now kill atalkd and restart it without problems. it also adds the appropriate module increment/decrement stuff so that you don't accidentally free the module while interfaces are still being used. finally, it plugs a potential low-memory hole in device creation.