+Added an image in: Natars/Artifacts spawn message, WW villages spawn
message and WW building plans spawn message
+Fixed a wrong time calculation when removing a building from the
construction queue, if there was present a master builder order
+Added a new table in the database, called "artefacts_chrono" which
stores the chronology of all artifacts
+Added the support for the artifacts chronology in 27_show.tpl
+Added the support for interacting with the artifacts chronology table in Database.php
+Cleaned the code in 27_show.tpl
+Some minor improovements and bug fixing
iopietro