hdf5_ep

[svn-r6504] Purpose:
    Why not?

Description:
    Lots of changes. This is basically a "commit because there are a lot
    of changes" commit.

    The server now acts more like a metadata caching server. The dumping
    mechanism finally works (I think). At least in the test I did it
    seemed to write things back. There's a new MPI TAG to use
    (H5FP_TAG_DUMP) when dumping things. Changed a lot of the functions
    from passing a structure around to just passing a pointer to that
    structure. I have no clue why I did it the previous way...

    Um...And more synchronization stuff between the client and server.
    The protocol between the two was being broke in a couple of places.

    We're getting closer!

Platforms tested:
    Linux (probably Modi4 too)

Misc. update: