Convert tabs to spaces.

[Hixie]

There's a bunch of places where tabs are used instead of spaces. I've no idea if it's intentional, but I noticed that in the help screen, it causes one paragraph to be overly indented on systems that use tab stops at 8 characters instead of 4, so I'm guessing it's not intentional.

This just replaces all tabs with four spaces uniformly.

Let me know if the better fix is just to change the help string but leave the others.

[ardera]

Dang it, I remember I changed the tabs to spaces in the help string some time ago.

I actually don't care that much whether its tabs or spaces. VS Code makes them behave mostly the same, which is also probably why there's some places where tabs are used and some places where spaces are used. Though I'd say I prefer tabs because its easier to erase them. (Pressing backspace 1 time v pressing backspace 4 times).

Let me know if the better fix is just to change the help string but leave the others.

I think that's better.

[Hixie]

updated