Fix names of weapon special helper events
Hardcode the list of creeps to generate

Wesnoth's kewl engine allows to get the list of all installed units,
but doesn't have a way to check whether they are from the currently played
era, leading to de-sync errors if the players have different sets of
installed add-ons.
Merge branch 'master' of git@github.com:lamefun/colossseum-xp.git