object, the sending object is included in the message. This is available
in GIB-scripted methods as the local variable "sender", which will be 0
if the sender was not an object.
and probably has enough bugs to leave the Orkin man scratching his head,
but it works and allows you to do neat things like write classes in GIB
(amazing!) and subclass builtin classes (which are Object and Thread at the
moment, Hash should be coming soon as a replacement for stem and leaf
variables).
