[svn-r19409] Purpose:

Add extra test cases for bug1975 h5diff - support recursive comparison on group when specified as an object.

Description:
 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_517.txt

@@ -0,0 +1,15 @@
+
+group1   group2
+---------------------------------------
+    x      x                   
+    x      x    /g2            
+    x           /g2/g3         
+    x           /g2/g3/dset1   
+    x           /g2/g3/g4      
+    x           /g2/g3/g4/dset2
+
+group  : </g1> and </g1>
+0 differences found
+group  : </g1/g2> and </g1/g2>
+0 differences found
+EXIT CODE: 1