Resolves issue with spectral and waterfall alignment with frequency

overlay.

Minor edits to MPT and P25 config editors

Resolved issue with channels not accepting channel config changes 
between restarts (processing chain was not being deleted)

Minor edits to P25 decoder state

src/controller/channel/Channel.java

@@ -904,10 +904,16 @@ public class Channel extends Configuration
 		{
 			mProcessingChain.stop();
 
-			mSelected = false;
-		}
+			if( mChannelType == ChannelType.STANDARD )
+			{
+				mProcessingChain.dispose();
+				mProcessingChain = null;
+			}
 
-		fireChannelEvent( Event.CHANNEL_PROCESSING_STOPPED );
+			mSelected = false;
+			
+			fireChannelEvent( Event.CHANNEL_PROCESSING_STOPPED );
+		}
 	}
 	
 	/**