avr: added code and messages for device information.

- send firmware information in DEVICE message
- introduced new version of VALUE message (sending UID now instead of
  timestamp)
- make SENDSTATS and RECVSTATS messages also send UID instead of timestamp

avr/twimaster.asm

@@ -366,6 +366,8 @@ twiReceiveByteSendAck_error:
 
 
 
+#ifdef WITH_DEBUG
+
 TWI_Master_ScanNext:
   in r15, SREG
   cli
@@ -418,5 +420,8 @@ TWI_Master_ScanNext_finshed:
 TWI_Master_ScanNext_end:
   out SREG, r15
   ret
+#endif
+
+