dactyl: use io.system and dactyl.echomsg

this combination is much more convenient.  o/ @Earnestly

i3status: remove run_watch
zsh: remove irssi alias, set auto_pushd
emacs: doin it rong

vim: nix things… some are defaults
vim: backup file settings and plugin

pam: bc env args
Revert "vim: dont ruin zenburn visual logic"

This reverts commit df2239d97817052a3f3a436f07d078b510883919.
zsh: hostname