bugzilla 1754: h5diff: support comparing through links.
(original check-in svn revision #18164)
Description:
fix the hang issue in parallel mode when compare external-link.
add --no-dangling-links option.
add test cases (#450-#459) relate to the new option.
improve test script to check exit code.
update --help relate to the new options.
correct some indentations.
Tested:
h5committest (jam, amani and linew)
The name of the files are now given by its full name relative to $srcdir
To avoid the printing of the complete full path of the test file, that hides
all the other parameters for long paths, the printing of the command line
is done first in TESTING with the name only of the test file, not its full path
the printing in the expected output that had the file name was removed as well as 3 tests that tested error messages in which the file name was present
tested: linux (in 2 different build directories relative to $srcdir), solaris
