Cleaned up stats collection.

- Removed the gap_report event.  It wasn't used anymore
   and functionally no more capable that scheduling events
   and using the get_gap_summary bif.

 - Added functionality to Dictionaries to count cumulative
   numbers of inserts performed.  This is further used to
   measure the total number of connections of various types.
   Previously only the number of active connections was
   available.

 - The Reassembler base class now tracks active reassembly
   size for all subclasses (File/TCP/Frag & unknown).

 - Improvements to the stats.log.  Mostly, more information.

src/Dict.h

@@ -71,6 +71,12 @@ public:
 			max_num_entries + max_num_entries2 : max_num_entries;
 		}
 
+	// Total number of entries ever.
+	uint64 NumCumulativeInserts() const
+		{
+		return cumulative_entries;
+		}
+
 	// True if the dictionary is ordered, false otherwise.
 	int IsOrdered() const		{ return order != 0; }
 
@@ -166,6 +172,7 @@ private:
 	int num_buckets;
 	int num_entries;
 	int max_num_entries;
+	uint64 cumulative_entries;
 	double den_thresh;
 	int thresh_entries;