{EAC} Shoot em UP

Adds {EAC} Shoot em UP.

Fixes  sorting bug  in ranking  plot to  make sure
it  is consistent  with  the  actual ranking  list
(first by capacity, descending, then by post date,
ascending).

Adds image links to post output.

 On branch master

 Changes to be committed:
	modified:   Ltt/Display.pm
	modified:   Ltt/Plotting.pm
	modified:   images/hdd_cap_by_size.png
	modified:   images/hdd_cap_by_vendor.png
	modified:   images/hdd_count_by_size.png
	modified:   images/hdd_count_by_vendor.png
	modified:   images/ltt_plot_grouped_by_contrib.png
	modified:   images/ltt_plot_grouped_by_count.png
	modified:   images/ltt_storage_rankings.png
	modified:   json/constants.json
	modified:   json/systems.json
	modified:   ltt-rankings.pl