Replaced nmap's hex dump functions with new hexdump() included in nbase. Before

Nmap used two functions: one of them, hdump(), just printed raw hex bytes 
(no ASCII equivalents) and the other one, lamont_hdump() had a bug when 
printing buffers where bufflen%16==3. A new function has been implemented 
from scratch, that basically produces the same output as Wireshark. 
Output looks like this:

0000   e8 60 65 86 d7 86 6d 30  35 97 54 87 ff 67 05 9e  .`e...m05.T..g..
0010   07 5a 98 c0 ea ad 50 d2  62 4f 7b ff e1 34 f8 fc  .Z....P.bO{..4..
0020   c4 84 0a 6a 39 ad 3c 10  63 b2 22 c4 24 40 f4 b1  ...j9.<.c.".$@..

Changes:

- The new hexdump() function has been added to nbase.
- Old hdump() and lamont_dump() have been removed from nmap's code.
- A wrapper to the new hexdump(), called nmap_hexdump(), has been added
  to nmap's utils.cc. The wrapper basically prints the buffer returned 
  by hexdump() using nmap's log_write() function.

nmap_rpc.cc

@@ -317,7 +317,7 @@ int send_rpc_query(Target *target_host, unsigned short portno,
     /* Simply send this sucker we have created ... */
     do {  
       if (o.debugging > 1)
-	hdump((unsigned char *) rpch, sizeof(struct rpc_hdr));
+	  nmap_hexdump((unsigned char *) rpch, sizeof(struct rpc_hdr));
       res = sendto(udp_rpc_socket, (char *)rpch, sizeof(struct rpc_hdr), 0,
 		   (struct sockaddr *) &sock, socklen);
       if (res == -1)