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

[Eli Zaretskii]

> Date: Tue, 14 Apr 2015 18:39:40 +0300
> From: Dmitry Gutov <dgutov@yandex.ru>
> CC: 20322@debbugs.gnu.org
> 
> On 04/14/2015 06:25 PM, Eli Zaretskii wrote:
> 
> > The alternative is not to configure indentation at all, but instead to
> > use the defaults, which are quite reasonable.
> 
> No, they're not.

Then by all means let's fix those modes whose defaults aren't.

> I'm not 100% sure what's the split in C and C++ communities

The vast majority of people I work with use tabs, FWIW.

> Even folks who want tabs have to configure stuff, because of our 
> `tab-width' default (which is indeed something we cannot change now): 
> http://stackoverflow.com/a/21788651/615245

Our tab-width default is simply the default tab width everywhere.