added xterm stuff for whenever urxvt breaks
changed keybinding `M-C-s' from poweroff to suspend; removed `M-C-r' (reboot) keybinding
added inc_append_history and share_history options; increased HISTSIZE and SAVESIZE; bindkey `^R' to search; added `ghci-color' alias; playing with `lspdf' function
added xterm*colorXX values