Merge of Gregor's conn-size branch.

If 'use_conn_size_analyzer' is true, the event engine tracks number of
packets and raw IP bytes per connection. If report_conn_size_analyzer
is true, these values are included as four new columns into conn.log

I changed conn.bro so that the value of report_conn_size_analyzer
follows that of use_conn_size_analyzer. For the new conn.log, we
probably want to get rid of report_conn_size_analyzer anyway.

src/Analyzer.h

@@ -227,6 +227,13 @@ public:
 
 	virtual unsigned int MemoryAllocation() const;
 
+	// Called whenever the connection value needs to be updated. Per
+	// default, this method will be called for each analyzer in the tree.
+	// Analyzers can use this method to attach additional data to the
+	// connections. A call to BuildConnVal will in turn trigger a call to
+	// UpdateConnVal. 
+	virtual void UpdateConnVal(RecordVal *conn_val);
+
 	// The following methods are proxies: calls are directly forwarded
 	// to the connection instance.  These are for convenience only,
 	// allowing us to reuse more of the old analyzer code unchanged.
@@ -366,7 +373,6 @@ public:
 		: Analyzer(tag, conn)	{ pia = 0; }
 
 	virtual void Done();
-	virtual void UpdateEndpointVal(RecordVal* endp, int is_orig) = 0;
 	virtual bool IsReuse(double t, const u_char* pkt) = 0;
 
 	virtual void SetContentsFile(unsigned int direction, BroFile* f);