vchoi_fork

[svn-r8713] Purpose:  Bug fix.

Description: This is the second effort to correct XML dumper after adding null
dataspace test for attribute and dataset.  Since XML schema hasn't been updated
for null space, took out null space test from tdset.h5 and tattr.h5 and put it
into a seperate file, tnullspace.h5.  Only h5dump tests this null space file;
XML dumper doesn't do it at this moment.  We'll wait until XML schema is updated
first.


Platforms tested:  h5committest and RH 8(fuss)

Misc. update:  MANIFEST(added two new files in tools/testfiles, tnullspace.h5
and tnullspace.ddl)