DIP 1029---Add throw as Function Attribute---Community Review Round 1

[IGotD-]

I agree with this change. The suggested solution will have very 
little or no impact on the current codebase while adding a useful 
feature.

I was originally for that we should use the "throws" keyword in 
order to make it more searchable. However, now when I see the 
solution and that "nothrow" will still remain I think that 
"throw" is better for symmetry with "nothrow".

Correct me if I'm wrong, what I've understood in the text is that 
making "nothrow" the default is also a goal which is not covered 
in this DIP but perhaps in a future DIP.