Smart color handling:

* if on Windows, no color, as usual
* if on Linux, color only on real term
  * no color when > foo
  * no color in the logfile

common/commonutil.h

@@ -53,4 +53,11 @@ void lsl(uint8_t *data, size_t len);
 int32_t le24toh(uint8_t data[3]);
 void htole24(uint32_t val, uint8_t data[3]);
 
+# define _BLUE_(s) "\x1b[34m" s "\x1b[0m "
+# define _RED_(s) "\x1b[31m" s "\x1b[0m "
+# define _GREEN_(s) "\x1b[32m" s "\x1b[0m "
+# define _YELLOW_(s) "\x1b[33m" s "\x1b[0m "
+# define _MAGENTA_(s) "\x1b[35m" s "\x1b[0m "
+# define _CYAN_(s) "\x1b[36m" s "\x1b[0m "
+
 #endif