[svn-r16218] Merging trunk 16217

Bug fix
PG compiler complains about array out of bounds (a rank of zero was not checked)
Adding a scalar dataset to the test generator program. this case is run on a previous existing run, the case was added to 2 existing files

Tested: windows, linux

tools/h5diff/testfiles/h5diff_58.txt

@@ -1,5 +1,5 @@
 dataset: </refreg> and </refreg>
-Referenced dataset      10272            10272
+Referenced dataset      10720            10720
 ------------------------------------------------------------
 Region blocks
 block #0           (2,2)-(7,7)           (0,0)-(2,2)

tools/h5diff/testfiles/h5diff_80.txt

@@ -32,6 +32,7 @@ file1     file2
     x      x    /g1/reference  
     x      x    /g1/reference2D
     x      x    /g1/reference3D
+    x      x    /g1/scalar     
     x      x    /g1/string     
     x      x    /g1/string2D   
     x      x    /g1/string3D   
@@ -687,6 +688,12 @@ position                                        difference
 [ 0 ]          1               0               1              
 [ 1 ]          2               0               2              
 48 differences found
+dataset: </g1/scalar> and </g1/scalar>
+size:           H5S_SCALAR           H5S_SCALAR
+position        scalar          scalar          difference          
+------------------------------------------------------------
+                2               1               1              
+1 differences found
 dataset: </g1/string> and </g1/string>
 size:           [2]           [2]
 position        string          string          difference          
@@ -854,7 +861,7 @@ position        vlen3D          vlen3D          difference
 [ 3 2 1 ]          59              0               59             
 59 differences found
 dataset: </refreg> and </refreg>
-Referenced dataset      10272            10272
+Referenced dataset      10720            10720
 ------------------------------------------------------------
 Region blocks
 block #0           (2,2)-(7,7)           (0,0)-(2,2)