Add a command line tool for sending VOEvent messages. Options for broker address and port, disable validation, digisig (-s keyID). Write broker's response to stdout, write errors (e.g. validation, couldn't conn.) to stderr. Allow piping into stdin, or -f msg-file.

Well, it's done but it can't easily be used with Scheduler. The VOEvent parser, SimpleTCP, and XMLSignatures assemblies are in a different namespace and have some other differences.

Move out of Scheduler solution, this is a general purpose VOEvent tool. Still include it with Scheduler package.