2.15 - fixed Bug in SaveConfig***, which didn't work.

- applied patch by Robb Canfield <robb@canfield.com>,
	   which fixes a bug in the variable interpolation
	   scheme. It did not interpolate blocks nor
	   blocknames. This patch fixes this. Patch slightly
	   modified by me(interpolation on block and blocknames).
	 - enhanced test for variable interpolation to
	   reflect this.
	 - added check if a named block occurs after the underlying
	   block is already an array, which is not possible.
	   perl cannot add a hashref to an array. i.e.:
	   <bl>
 	     a = 1
	   </bl>
	   <bl>
 	     b = 1
	   </bl>
	   <bl blubber>
 	     c = 1
	   </bl>
	   As you can see, "<bl>" will be an array, and "blubber"
	   cannot be stored in any way on this array.
	   The module croaks now if such construct occurs.


git-svn-id: http://dev.catalyst.perl.org/repos/Config-General/trunk@41 be1acefe-a474-0410-9a34-9b3221f2030f

t/cfg.16

@@ -14,3 +14,19 @@ pr=$me/blubber
     home = $base/home/max # $base should be interpolated
   </users>
 </etc>
+
+# block(name) test
+tag  = dir
+mono = teri
+<$tag>
+  bl = 1
+</$tag>
+<$tag mono>
+  bl = 2
+</$tag>
+<text $mono>
+  bl = 3
+</text>
+<$tag $mono>
+  bl = 3
+</$tag>