Support namespaces / modules in bif. Checkpoint.

(now actually commiting all the files)

This change is actually two-fold:
a) bif's now accept module XYZ; statements and module::ID for
   function, const, event, enum, etc. declartation
b) Added C++-namespaces to variables, functions, etc. that are declared
   in bif but accessed from C++
   This required some (lightweight) re-factoring of the C++ codes.
   Note, event's don't have their own C++ namespace yet, since this
   would require a rather huge re-factoring.

Compiles and passes test suite.
New namespace feature not tested yet.
Documentation to follow.

src/Scope.h

@@ -1,5 +1,6 @@
 // $Id: Scope.h 6219 2008-10-01 05:39:07Z vern $
 //
+//
 // See the file "COPYING" in the main distribution directory for copyright.
 
 #ifndef scope_h
@@ -11,6 +12,7 @@
 #include "Obj.h"
 #include "BroList.h"
 #include "TraverseTypes.h"
+#include "module_util.h"
 
 class ID;
 class BroType;
@@ -59,14 +61,6 @@ protected:
 	id_list* inits;
 };
 
-static const char* GLOBAL_MODULE_NAME = "GLOBAL";
-
-extern string extract_module_name(const char* name);
-extern string normalized_module_name(const char* module_name); // w/o ::
-
-// Concatenates module_name::var_name unless var_name is already fully
-// qualified, in which case it is returned unmodified.
-extern string make_full_var_name(const char* module_name, const char* var_name);
 
 extern bool in_debug;