Add signal "day_changed", allow date format in logger options path and mask (task #9430)

src/plugins/logger/logger-buffer.h

@@ -29,6 +29,8 @@ struct t_logger_buffer
     FILE *log_file;                       /* log file                       */
     int log_enabled;                      /* log enabled ?                  */
     int log_level;                        /* log level (0..9)               */
+    int write_start_info_line;            /* 1 if start info line must be   */
+                                          /* written in file                */
     struct t_logger_buffer *prev_buffer;  /* link to previous buffer        */
     struct t_logger_buffer *next_buffer;  /* link to next buffer            */
 };