Merging in 'topic/robin/cleanup-rewriter'.

Removing everything related to trace rewriting.

(I wasn't too careful in ensuring that I catch everything in the
scripts; Seth is working on those anyway.)

(Merging by cherry-picking the corresponding commit, as the branch was
accidentally made off of the logging stuff).

src/UDP.h

@@ -6,9 +6,6 @@
 #define udp_h
 
 #include "Analyzer.h"
-#include "Rewriter.h"
-
-class UDP_Rewriter;
 
 typedef enum {
 	UDP_INACTIVE,	// no packet seen
@@ -27,10 +24,6 @@ public:
 
 	static bool Available() { return true; }
 
-	// -- XXX -- only want to return yes if the protocol flag is
-	//  on similar to TCP. (e.g. FTP_Connection etc.) /mc
-	int RewritingTrace() const	{ return 0; }
-
 protected:
 	virtual void Done();
 	virtual void DeliverPacket(int len, const u_char* data, bool orig,