Support for (mixed) MPLS and VLAN traffic, and a new default BPF

filter. (Seth Hall and Robin Sommer)

- Merging in the patch from #264, which provides support for mixed
  VLAN and MPLS traffic.

- Changing Bro's default filter from being built dynamically to being
  a static "ip or not ip". To get the old behaviour back (i.e., the
  dynamically built filter), redef "all_packets" to false.

- print-filter.bro now always prints the filter that Bro is actually
  using, even if overriden from the command line.

src/NetVar.cc

@@ -260,6 +260,8 @@ int record_all_packets;
 RecordType* script_id;
 TableType* id_table;
 
+StringVal* cmd_line_bpf_filter;
+
 #include "const.bif.netvar_def"
 #include "types.bif.netvar_def"
 #include "event.bif.netvar_def"
@@ -313,6 +315,9 @@ void init_general_global_var()
 	trace_output_file = internal_val("trace_output_file")->AsStringVal();
 
 	record_all_packets = opt_internal_int("record_all_packets");
+
+	cmd_line_bpf_filter =
+		internal_val("cmd_line_bpf_filter")->AsStringVal();
 	}
 
 void init_net_var()