[TxMt] Defaulting to soft tabs + undoing hard tabs

[Joe Lapp]

I've just been troubleshooting why so many of my files have hard tabs
in them.  Now I see that whenever I create a new file in TextMate, it
defaults to hard tabs.  Two questions:

(1) How do I have TextMate automatically assume soft tabs 2 when I
create a new file?

(2) Is there a way to have TextMate convert hard tabs to soft tabs on
save, so I can easily fix this mess?

I think once upon a time I knew that I had to manually set soft tabs
for each new file, but at some point I forgot.

~joe