* registrar: group by hostname or group env var in registrar
* registrar: should remove invalid windows from registry when detected
* tide: Ctrl+D should not pass tag name as arg when executing tag commands
-* tide: 'Get' tag with argument currently segfaults
* tide: should re-register with the registrar when a new registrar is launched
* tide: Line - Get the current line number(s) containing the selection
+* tide: Kill - add a 'Kill' tag to kill the most recent job
* tide: gap buffer does not handle UTF-8 currently
* edit: hangs after launching an empty tide instance then trying to open already open file