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

[Stefan Monnier]

> Now, provided we agree to default to spaces in the majority of the popular
> programming languages modes, what's the reasoning not to flip the default?

The reasoning is simple: the actual value matters much less than the fact
that it is changed.
If the default had been nil, I'd also oppose a change to set it to t for
the same reason.

IOW it is pure inertia.  *Very* few people would come a thank us for the
change, but many more will complaint.


        Stefan