hdf5_msb

[svn-r9850] Purpose:

1) Provide facilities in cache to allow us to avoid a potential cache
   consistency bug in the parallel case.

2) Clean up a off by one sanity checking bug.

3) Turn off execution of long running tests in debug mode.


Description:

1) In the parallel case, all writes to metadata must be collective,
   but reads may not be.  In pricipal, this allows us to different
   contents in different caches.  This isn't a problem as long as the
   correct data is always on disk, but unless we can force certain
   writes immediately, that need not be the case.

2) & 3) should need no further explanation.


Solution:

1) Add code allowing us to mark cache entries, and then force
   these entries to be flushed at a later time.

   Note that to actually avoid the bug, we will have to modify
   existing code to use these new features.

2) & 3) should need no further explanation.


Platforms tested:

heping (serial debug and production)

committest (copper, sol, and heping).  test failed on heping in the
c++ portion of the build, but at Quincey's siggestion, I am proceeding
with the checkin.


Misc. update: