Ignore Divesoft Button Press Events

Prevent button press events from showing on the profile
graph when we import divesoft DLF files.

Reported-by: Marc Arndt
Signed-off-by: Marc Arndt <marc@marcarndt.com>

core/parse-xml.c

@@ -3628,6 +3628,10 @@ int parse_dlf_buffer(unsigned char *buffer, size_t size)
 		case 3: /* diver error */
 		case 4: /* internal error */
 		case 5: /* device activity log */
+			//Event 18 is a button press. Lets ingore that event. 	 
+		    if (ptr[4] == 18)
+				continue;
+			
 			event_start();
 			cur_event.time.seconds = time;
 			switch (ptr[4]) {