[Mpi3-ft] Nonblocking Process Creation and Management

[Josh Hursey]

I extended and cleaned up the Nonblocking Process Creation and  
Management proposal on the wiki:
    https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/Async-proc-mgmt

I added the rest of the nonblocking interface proposals, and touched  
up some of the language. I do not have an implementation yet, but will  
work on that next. There are a few items that I need to refine a bit  
still (e.g., MPI_Cancel, mixing of blocking and nonblocking), but this  
should give us a foundation to start from.

I would like to talk about this next week during our working group  
slot at the MPI Forum meeting.

Let me know what you think, and if you see any problems.

Thanks,
Josh