There was a problem where trying to bind .v4 and .v6 listeners would set them
to None if there was nothing to bind (if, say, you weren't binding an IPv6
listener).  Later, the code then would try to call a member function of the
listener.  The member function would not do anything if there was no listener,
but trying to dereference None yielded the broken behavior.

address families.

connections.

Seems to affect Linux servers.  Ed Maste says the patch fixes it for him.

I don't have a Mac that can build it.  Hopefully ppc will run fine on ppc64.

Just as a quick reminder, in case you're building a fat binary and you don't
have all the architectures actually installed.

The ssh hostname should immediately follow the -r parameter.

@objc.accessor isn't the right thing to use for a Core Data Validation
function.  Yowee, PyObjc sure is non-obvious.

Some people don't have all of them installed, so auto-detect them by
looking at the available arches in /usr/libexec.

...and search for those null bytes before looking for the sync string.

This helps when people have misconfigured .bashrc to print messages even in
non-interactive mode.  (On my Debian Lenny system, .bashrc doesn't seem to
run when you do 'ssh localhost ls', but on MacOS servers, it does.  Hmm...)

This gets rid of an extra intermediate sh process on the server that we were
keeping for no good reason, since it would exit as soon as python exited
anyway.