[Tagging] tunnel=building_passage or covered=yes

[Tobias Knerr]

On 11.09.2016 12:46, Dave F wrote:
> But it's *not a tunnel*

Before there was any dedicated tag for it, many people mapped it as 
tunnel=yes, so people definitely appear to intuitively consider it 
tunnel-like. (Perhaps that's also a language issue, not sure.)

That's why the new value was also put into the tunnel key.

Technically, covered might have been better, but either one is a lot 
better than tunnel=yes. At least it can now be clearly distinguished 
from actually tunnels.