Massive detabbing of the source

[Jan Stolarek]

> I don't think it's worth the bother either: conflicts are a pain and
> slow down development, whereas tabs don't. (...) there certainly are a
> few active branches with large-scale changes.
That's another good point.

I looked through the git history and it seems there are actually few tabbed files that weren't 
touched for the last 6 months. It follows that tabbed files that people work on are not being 
actually detabbed by them, unless the policy is to detab only the parts that are modified, not 
the whole file. 

I won't do this massive detabbing of the whole source since it indeed could cause more problems 
than profits, but my opinion is that at some point detabbing should be just done or otherwise 
those -fno-warn pragmas and tabs will stay in the source code forever. Perhaps it would be a good 
idea to detab a bunch of files every month?

Janek