Add Command.Name.
echo: add trivial ping command that pongs
echo: drop ping command (reserve name)
admin: move sendraw to new admin plugin
admin: half-baked login command
tester.Sendf can take an account name in target.
admin: add register command and use scrypt
Drop target argument from Tester.Send*.
Add Tester.SendRawf.
Replace SendRawf by an option of Sendf's prefix.
admin: QUIT and NICK log the user out
admin: fix cross-account logins
Use [@account] syntax for Tester.Recv* as well.