bug#20322: 25.0.50; indent-tabs-mode should default to nil

[Eli Zaretskii]

> Date: Fri, 17 Apr 2015 10:26:44 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 20322@debbugs.gnu.org
> 
> I'm saying that this default doesn't bother me, as long as the modes
> that I care about still default to non-nil.

Btw, I'm also okay with introducing a new feature that would keep the
current style in existing files, something mentioned by Glenn.  I
guess this would need a new value of indent-tabs-mode, and code to
support that.  Maybe this is a compromise everyone would be at least
half-happy with.