hdf5_der

[svn-r20435] Purpose:

    Add H5FDcoordinate and respective sub-functions for
    mpio and mpiposix drivers.

Description:

    For now, the purpose of the 'coordinate' function is to
    allow parallel file drivers to share their locally
    tracked EOF values, determine the maximum of all
    local values, and update the actual EOF in each
    process with this true EOF.

    Without a clear goal for where this function will
    actually end up, it's been written to be pretty
    extensible for additional abilities. It accepts an
    enumerated value to determine what function to perform
    (currently only determining and synchronizing maximum
    EOF value), as well as an optional void *.

Tested:

    Tested on jam with new parallel truncation test.