hdf5_chunking_query_bmr

[svn-r3936] Purpose:
    Feature Add
Description:
    Added the feature (not a bug, a FEATURE!) that, if the person has the
    env variables USER or LOGIN set, then it will place the temporary
    files in the "/tmp/$USER" or "/tmp/$LOGIN" directory (in that order).
    This is only if the prefix the user gives is the default one "/tmp".

    After the tests are finished, it will remove the directory for the
    user.
Platforms tested:
    Linux