common code: Add feature to select debug category rather than showing all

src/common/debug.h

@@ -15,11 +15,15 @@
 #define DCALL		8
 #define DMNCC		9
 #define DDB		10
+#define DTRANS		11
 
 #define PDEBUG(cat, level, fmt, arg...) _printdebug(__FILE__, __FUNCTION__, __LINE__, cat, level, fmt, ## arg)
 void _printdebug(const char *file, const char *function, int line, int cat, int level, const char *fmt, ...);
 
 const char *debug_amplitude(double level);
 
+void debug_list_cat(void);
+int parse_debug_opt(const char *opt);
+
 extern int debuglevel;