hdf5_ep

[svn-r9370] Purpose:
    Refactor code

Description:
    Refactor common code for determining the native type for using in the
tools into separate routine.

    Also, reduce diffs between the two branches and bring back some fixes from
the development branch to the release branch.

Platforms tested:
    FreeBSD 4.10 (sleipnir)
    too minor to require h5committest