_PATH_DEFPATH add an "ssh-to" dialog which auto-completes based on contents of ~/.ssh/known_hosts (M-.) testing and eyeballing by Simon Kuhnle <simonkuhnle at web.de>, todd@, pedro@ mk@ and David Cathcart <david at cathcart.cx> ok todd@
(eg. when they're hidden, now you can cycle through them) from aon@iki.fi
"looks good" pedro@, ok matthieu@
key binding.
tested by sturm@, ok matthieu@