[svn-r19411] Purpose:

Add extra test cases for Bug1975 h5diff - support recursive comparison on group when specified as an object

Description:
 Merged from hdf5 trunk (r19409)
 Additional tests for combination of group recursive and --follow-symlinks 
 with multi-linked external links with several files (same name/strucure).

Tested:
 jam, amani, heiwa

tools/h5diff/testfiles/h5diff_516.txt

@@ -0,0 +1,32 @@
+
+file1     file2
+---------------------------------------
+    x      x    /              
+    x      x    /dset1         
+    x      x    /g1            
+    x      x    /g1/g2         
+    x      x    /g1/g2/g3      
+    x      x    /g1/g2/g3/dset1
+    x      x    /g1/g2/g3/g4   
+    x      x    /g1/g2/g3/g4/dset2
+    x      x    /soft_dset1    
+
+group  : </> and </>
+0 differences found
+dataset: </dset1> and </dset1>
+0 differences found
+group  : </g1> and </g1>
+0 differences found
+group  : </g1/g2> and </g1/g2>
+0 differences found
+group  : </g1/g2/g3> and </g1/g2/g3>
+0 differences found
+dataset: </g1/g2/g3/dset1> and </g1/g2/g3/dset1>
+0 differences found
+group  : </g1/g2/g3/g4> and </g1/g2/g3/g4>
+0 differences found
+dataset: </g1/g2/g3/g4/dset2> and </g1/g2/g3/g4/dset2>
+0 differences found
+dataset: </soft_dset1> and </soft_dset1>
+0 differences found
+EXIT CODE: 0