Switched auto-fill shortcut to auto-fill-80

auto-fill-80 sets the default fill-column to 80 in addition to turning
on auto-fill-mode.
Added shortcut for line numbers
Added customization to change the default font/size

Set the default font size to be 8 pt Courier New.
Enabled narrow-to-region and upcase-region

I used these commands enough that I don't want emacs warning me about them