trylink: produce even more info about final link stage

trylink: explain how to modify link and drastically decrease amount
  of padding (unfortunately, needs hand editing ATM).
*: add ALIGN1 / ALIGN2 to global strings and arrays of bytes and shorts

size saving: 0.5k

networking/udhcp/common.c

@@ -6,4 +6,6 @@
 
 #include "common.h"
 
-const uint8_t MAC_BCAST_ADDR[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = {
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};