improving the D spec

[Christian Kamm]

Leandro Lucarella wrote:
> Thank you for the great job. Following your example, I created a meta-bug
> for each category to easily keep track of them =)

Thanks! I was not sure how to make the groupings permanent - and putting it 
directly into bugzilla is a good idea! 

> Any distinction between '*' and '+'? 1351 is duplicated, did you mean
> other bug?

I think bugs with a * might be fixable without touching the compiler, while 
+ bugs probably aren't. I think 1351 was in there twice for a reason, it 
contains more than one issue.