make sure we don't have namespace clashes between libraries and apps

* All loging prefixes in libraries should be DL like DLINP
* All signals / subsystems should be called S_L_* SS_L_*
* All command nodes should be called L_*_NODE

This makes sure existinc code still compiles as expected
diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index 04692d3..20c1254 100644
--- a/include/osmocom/core/logging.h
+++ b/include/osmocom/core/logging.h
@@ -39,12 +39,12 @@
 /* logging levels defined by the library itself */
 #define DLGLOBAL	-1
 #define DLLAPDM		-2
-#define DINP		-3
-#define DMUX		-4
-#define DMI		-5
-#define DMIB		-6
-#define DRSL		-7
-#define DNM		-8
+#define DLINP		-3
+#define DLMUX		-4
+#define DLMI		-5
+#define DLMIB		-6
+#define DLRSL		-7
+#define DLNM		-8
 #define OSMO_NUM_DLIB	9
 
 struct log_category {