[development] death to "x.y.z" version is now inevitable

[Earl Miles]

Moshe Weitzman wrote:
>> 6.x-dev vs. 5.x-dev is great, as it clearly defines "this is something 
>> that should get fixed in this release" vs. "this is something we 
>> should put off until the next release."
> 
> isn't that basically what status=postponed means? we should remove 
> 6.x-dev or postponed, IMO.

postponed is a wasteland that no one will ever look at except when there isn't 
enough to do already. postponed can mean a lot of things, and in general means 
"it isn't that important."