+SC/08 Eximstats: whilst parsing the mainlog(s), store information about
+ the messages in a hash of arrays rather than using individual hashes.
+ This is a bit cleaner and results in dramatic memory savings, albeit
+ at a slight CPU cost.
+
+SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
+ as requested by Marc Sherman.
+
+SC/10 Eximstats: added histograms for user specified patterns as requested
+ by Marc Sherman.
+
+SC/11 Eximstats: v1.43 - bugfix for pattern histograms with -h0 specified.
+