hdf5_ep

[svn-r4038] Purpose:
    Code clean/bug fix
Description:
    H5FL (free-list manager) code currently is taking an hsize_t as the size
    of a memory block to allocate.  On many machines, the size of an hsize_t
    is greater than the size of a size_t, potentially leading to incorrect
    memory allocations in rare circumstances.
Solution:
    Changed hsize_t parameters and variables to size_t.
Platforms tested:
    FreeBSD 4.3 (hawkwind)