Add functions comp-conf and comp-source heavily inspired by romkatvs
jit & jit-source.
Replace every call to source with comp-source.
Remove existence check since it is done in comp-source.
Replace still existing readable checks with existence checks.
Switch from gnome-terminal to st (see fork on github).
Open new terminal by default in the same working-dir as current window.
Modify scratchpad-terminal to work with every terminal.
