SHA256Generator: Don't fall back to Sha256Standalone,

SHA-256 support must now be in the JRE.
Deprecate all uses of Sha256Standalone, schedule for removal
in 0.9.27. This will require a new Syndie release.

core/java/src/gnu/crypto/hash/BaseHashStandalone.java

@@ -51,7 +51,9 @@ package gnu.crypto.hash;
  * See SHA256Generator for more information.
  *
  * @version $Revision: 1.1 $
+ * @deprecated to be removed in 0.9.27
  */
+@Deprecated
 public abstract class BaseHashStandalone implements IMessageDigestStandalone {
 
    // Constants and variables

core/java/src/gnu/crypto/hash/IMessageDigestStandalone.java

@@ -54,7 +54,9 @@ package gnu.crypto.hash;
  * See SHA256Generator for more information.
  *
  * @version $Revision: 1.1 $
+ * @deprecated to be removed in 0.9.27
  */
+@Deprecated
 public interface IMessageDigestStandalone extends Cloneable {
 
    // Constants

core/java/src/gnu/crypto/hash/Sha256Standalone.java

@@ -64,7 +64,9 @@ package gnu.crypto.hash;
  * See SHA256Generator for more information.
  *
  * @version $Revision: 1.2 $
+ * @deprecated to be removed in 0.9.27
  */
+@Deprecated
 public class Sha256Standalone extends BaseHashStandalone {
    // Constants and variables
    // -------------------------------------------------------------------------