Take care of test case fail for h5repack from checkin (r18164)
Description:
Previous checkin didn't allow h5diff to return succeed when a link's
target object doesn't exist. Changed it to succeed with warning.
(Need to discuss related feature)
Tested on Jam
Add test cases for h5diff check-in (svn revision #18164).
Description:
This test cases are for testing comparing through various link combinations
relate to bugzilla report 1754.
Also improved the test script to handle external link cases and
simplified to use single line instead of double for each test cases.
Tested on Jam