[Mpi3-rma] Updated MPI-3 RMA proposal 1

[Rajeev Thakur]

> The problem is that the definition of the "minimal set of 
> things needed" 
> is different for different people. That's why this definition 
> is vague. 

One definition of inclusion in proposal 1: if feature X is not added, we
could as well just leave MPI-2 RMA as it is and go home.

One definition of not including in proposal 1: if feature Y is so really
needed, why is there vehement disagreement?

Rajeev