[svn-r7018] Purpose:

    Bug fix

Description:
    The dataset's modification time was getting set whenever raw data was
written with H5Dwrite.  Unfortunately, this is a metadata change (which are
required to be performed collectively) and H5Dwrite may be called independently
from a parallel program, resulting in metadata cache corruption and/or program
hangs.

Solution:
    Don't update the modification time when raw data it written. :-(

Platforms tested:
    FreeBSD 4.8 (sleipnir) w/parallel
    h5committest

Misc. update:
    Noted in release notes and also sent to Frank for updating the docs.

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