3 " Automatically continue indentation across lines
5 " Keep indentation structure (tabs, spaces, etc) when autoindenting.
7 " Automatically indent new lines after specific keywords or braces
9 " Don't jump to the start of a line when typing #
15 " Delete this many space chars when pressing backspace
19 " Use :retab to change the file to entirely space indents
20 " Use :retab! to change the file to entirely tab indents