more name hint interace updates

- add long card name to device description
- create empty PCM plugin to allow right hint description parsing
- reorder devices in alsa.conf
- make namehint more configurable (using default.namehint.showall switch)
- add two levels basic and exteded for hints to default configuration files
- do not show direct device aliases
- removed all known memory leaks

src/conf/pcm/surround51.conf

@@ -39,16 +39,20 @@ pcm.!surround51 {
 			}
 		}
 	}
-	@func refer
-	name {
-		@func concat
-		strings [
-			"cards."
-			{
-				@func card_driver
-				card $CARD
-			}
-			".pcm.surround51." $DEV ":CARD=" $CARD
-		]
+	type empty
+	slave.pcm {
+		@func refer
+		name {
+			@func concat
+			strings [
+				"cards."
+				{
+					@func card_driver
+					card $CARD
+				}
+				".pcm.surround51." $DEV ":CARD=" $CARD
+			]
+		}
 	}
+	hint.description "5.1 Surround output to Front, Center, Rear and Subwoofer speakers"
 }