Fixed getpeername/getsockname situation

- Added IPv6 support to getsockname
- Simplified getpeername implementation
- Added family to return of getsockname and getpeername
and added modification to the manual to describe

doc/udp.html

@@ -140,8 +140,12 @@ Retrieves information about the peer
 associated with a connected UDP object.
 </p>
 
-<p class="return">
-Returns the IP address and port number of the peer.
+
+<p class=return>
+Returns a string with the IP address of the peer, the 
+port number that peer is using for the connection, 
+and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>"). 
+In case of error, the method returns <b><tt>nil</tt></b>. 
 </p>
 
 <p class="note">
@@ -159,10 +163,12 @@ unconnected:<b>getsockname()</b>
 Returns the local address information associated to the object.
 </p>
 
-<p class="return">
-The method returns a string with local IP
-address and a number with the port. In case of error, the method
-returns <b><tt>nil</tt></b>.
+
+<p class=return>
+The method returns a string with local IP address, a number with 
+the local port, 
+and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>"). 
+In case of error, the method returns <b><tt>nil</tt></b>.
 </p>
 
 <p class="note">