Add Xmodmap files for switching between Mac and PC keyboards
Removed old, commented setting for irssi
Remove config for menucolors Nethack patch

MenuColors should be added to core but until then I'd prefer not to have
to comment/uncomment these lines depending on how/where I installed
Nethack.
No need to call netcat when ssh-ing through a bastion host

ssh has this builtin. Woot.
Make sure we only have one xcape running at a time