port requires c++1y -> use cxx11 portgroup?

[Ken Cunningham]

> 
> C++1y and C++14 are the same.

Apparently not exactly the same — somewhere in Pingus or its included bits there was a specific note about changing back to c++1y as some compilers accepted that but not c++14.

> 
> The cxx11 portgroup does not express the correct restrictions for C++14,
> but it could be extended to do so. C++11 is already most of the way
> there.

thanks! should I add it now to Pingus, or leave it as it is do you think?

- Ken