[svn-r20350] Purpose:

Fixed CHICAGO: Bug 2121 - h5diff - incorrect and lack of output for the 
    different set of attributes (different number and names)

Description:
    Merged from HDF5 trunk r20334.
    This is related to previous checkin r20299.
    Add help page update for verbose option level feature, which displays 
    useful information about attribute difference with -v1, --verbose=1 -v2 
    or --verbose=2 option.

     
Tested:
 jam (linux32-LE), amani (linux64-LE), heiwa (linuxppc64-BE)

tools/h5diff/testfiles/h5diff_615.txt

@@ -9,7 +9,16 @@ usage: h5diff [OPTIONS] file1 file2 [obj1[ obj2]]
    -h, --help              Print a usage message and exit.
    -V, --version           Print version number and exit.
    -r, --report            Report mode. Print differences.
-   -v, --verbose           Verbose mode. Print differences, list of objects.
+   -v --verbose            Verbose mode. Print differences information and list
+                           of objects.
+   -vN --verbose=N         Verbose mode with level. Print differences and list
+                           of objects.
+                           Level of detail depends on value of N:
+                            0 : Identical to '-v' or '--verbose'.
+                            1 : All level 0 information plus one-line attribute
+                                status summary.
+                            2 : All level 1 information plus extended attribute
+                                status report.
    -q, --quiet             Quiet mode. Do not produce output.
    --follow-symlinks       Follow symbolic links (soft links and external links)
                            and compare the links' target objects.