How to grow the Fortran I/O parameter struct and keep ABI compatibility

[FX Coudert]

>   What's the problem with just adding a new 'extended private  
> stuff' field to
> the very end of the struct and allocating one of the remaining flag  
> bits to
> say if it's present or not?

That requires to have a version of the library that can work without  
it, and it's one more requirement on the code we write :)
But we can do it, I guess.

FX