[svn-r16348] #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

tools/h5diff/testfiles/h5diff_615.txt

@@ -10,6 +10,7 @@ usage: h5diff [OPTIONS] file1 file2 [obj1[obj2]]
    -r, --report            Report mode. Print differences
    -v, --verbose           Verbose mode. Print differences, list of objects
    -q, --quiet             Quiet mode. Do not do output
+   -c, --compare           List objects that are not comparable
    -N, --nan               Avoid NaNs detection
    -n C, --count=C         Print differences up to C number
    -d D, --delta=D         Print difference when greater than limit D