new DIP47: Outlining member functions of aggregates

[Gary Willoughby]

> I have never worked on any reasonably large Java/C# code base. 
> But it C++ once amount of entities grows large enough clear 
> interface overview in header files is basically only way to get 
> familiar quickly with sources.

This is a job for the *documentation* and if documentation is 
automatically generated (which it is, see '-D') then this 
argument is moot.

> I don't think it will matter at all. As it was mentioned, usage 
> of such feature tends to be private business of certain project 
> - it won't propagate to yours  if you don't use it.

Except when dealing with books, tutorials, third party libraries, 
pull requests, etc...

I dismay.