Import the new logging architecture

This is the new logging architecture, including

* support for multiuple logging targets like stderr and vty
* log levels in addition to categories/subsystems
* filtering based on imsi, i.e. only see events for one subscriber
* dynamically change log level for each category for each vty
diff --git a/openbsc/src/ipaccess-config.c b/openbsc/src/ipaccess-config.c
index c50a465..005c93d 100644
--- a/openbsc/src/ipaccess-config.c
+++ b/openbsc/src/ipaccess-config.c
@@ -289,6 +289,12 @@
 	struct gsm_bts *bts;
 	struct sockaddr_in sin;
 	int rc, option_index = 0, stream_id = 0xff;
+	struct debug_target *stderr_target;
+
+	debug_init();
+	stderr_target = debug_target_create_stderr();
+	debug_add_target(stderr_target);
+	debug_set_all_filter(stderr_target, 1);
 
 	printf("ipaccess-config (C) 2009 by Harald Welte\n");
 	printf("This is FREE SOFTWARE with ABSOLUTELY NO WARRANTY\n\n");