Clarify readme for disc image

Some users were having trouble spotting that to use the boot sequence prior to RISC OS 5 requires merging the !System download

Version 0.56. Tagged as 'ABRelease-0_56'

Resources/DiscDev/ReadMe.txt

@@ -5,6 +5,12 @@ This is the standard HardDisc4 disc image. It is a
 bleeding-edge build which comes from the latest revisions of all the relevant
 sources in our source code repository and is completely untested.
 
+The disc image includes the universal boot sequence (!Boot application), when
+used with versions of the operating system prior to RISC OS 5 you will need 
+to merge some extra modules into the !System application, these are already
+present in the RISC OS 5 ROM. The !System application is available as a 
+separate download.
+
 Some components in this archive are released under the licence (included in
 this archive as Licence_v1_1.pdf), or see:
 

VersionNum

-/* (0.55)
+/* (0.56)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        0.55
+#define Module_MajorVersion_CMHG        0.56
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                29 Sep 2013
+#define Module_Date_CMHG                23 Oct 2013
 
-#define Module_MajorVersion             "0.55"
-#define Module_Version                  55
+#define Module_MajorVersion             "0.56"
+#define Module_Version                  56
 #define Module_MinorVersion             ""
-#define Module_Date                     "29 Sep 2013"
+#define Module_Date                     "23 Oct 2013"
 
-#define Module_ApplicationDate          "29-Sep-13"
+#define Module_ApplicationDate          "23-Oct-13"
 
 #define Module_ComponentName            "ABRelease"
 #define Module_ComponentPath            "castle/RiscOS/Utilities/Autobuild/ABRelease"
 
-#define Module_FullVersion              "0.55"
-#define Module_HelpVersion              "0.55 (29 Sep 2013)"
-#define Module_LibraryVersionInfo       "0:55"
+#define Module_FullVersion              "0.56"
+#define Module_HelpVersion              "0.56 (23 Oct 2013)"
+#define Module_LibraryVersionInfo       "0:56"