Support for tab indentations?

[remorse]

Hi! I know that the current vogue is to only indent with spaces, but I find that two spaces is not nearly wide enough for me to see a hierarchy well. I have hacked in support for tab indentation (well, "hacked" is not the word, in changes two lines). Would you be willing to add a command-line flag to use tabs instead of two spaces for indentation?

(I used tabs instead of four spaces because people can set tab-stops to be whatever they find the best -- four spaces is what I would use, but some may want three or six, etc.)

Thanks,
Ricky