vchoi_fork

[svn-r4506] Purpose:
    Bug fix/optimization.
Description:
    Single, contiguous (in memory) hyperslabs are able to be transferred in one
    I/O operation, but weren't being detected correctly by the code in
    H5S_all_read()/H5S_all_write() and were getting routed into slower I/O
    routines.  (Or, possibly failing in some circumstances)
Solution:
    Wrote code to correctly detect single contiguous hyperslabs in memory and
    adjust arrays and buffer pointers describing the memory information so that
    the entire hyperslab can be transferred in one operation.
Platforms Tested:
    FreeBSD 4.4 (hawkwind)