Work for bugzilla 1754: h5diff: support comparing through links.
Description:
merged from hdf5 trunk (18164, 18165, 18166, 18167, 18170, 18266, 18273)
Tested:
h5committest (jam, amani and linew)
" Use "--use-system-epsilon" for system EPSILON
" Use "-p" or "-d" for whatever user's choice of epsilon
" Use "-p 0" or "-d 0" for strict equality (same as default)
#1368 (E1) h5diff: implement "not comparable" messages. Implemented RFC. The new option is <-c, --compare List objects that are not comparable>
added some test cases
tested: windows, linux
Added an option to avoid dealing with NaNs
-N, --nan Avoid NaNs detection
Note: there is no shell script run for datasets with NaN because the output is non portable (different results and NaN strings for different systems)
Tested: windows, linux
