hdf5_ep

[svn-r4851] Purpose:
    Bug Fix
Description:
    When file space was returned to the file space free-list for reuse,
    occasionally raw data allocations which used space from the free-list
    would overlap with the metadata accumulator and get over-written with
    the cached information in the accumulator, corrupting the data.
Solution:
    Check if the space about to be recycled on the free-list is going to be
    used for raw data and also overlaps with the metadata accumulator cache,
    avoiding using space that fits those criteria.

    This fixes bug #701

Platforms tested:
    FreeBSD 4.5 (sleipnir)