Committing carn's modifications to events and other things. Full details below.

http://forums.nanotrasen.com/viewtopic.php?f=16&t=12245#p189186

Ported all the random events to Pete/Gia's event system:
>Event system now supports weighting. default is 10. a weight of 5 is half as likely as default, 20 twice as likely....etc.
>Increased the frequency of events (dust happens over 60% of the time though)
>tidied up some ninja code: ninjas now get ~5 objectives. So they are hardmode.
>made the gravity toggle into a random event
>event system now supports round-start events
>event system now supports holiday events
>event system now supports events which can only happen after the round has lasted a certain number of ticks
>event system now supports max_occurrences for events. Setting any event's max_occurrences to 0 will stop it randomly occurring
>events now support being fed associative lists inside new(). This allows you to override their variables easily.
>wormhole events no longer cause loads of lag. They are extremely deadly. wormholes should be avoided

Other:
>replaced the procs for fetching candidates for ninjas and aliums with /proc/get_candidates(be_special_flag), it returns a list of active clients with that be_special preference enabled.
>minor fixes to minds
>your memories are displayed to you at Login()
>removed aliens_allowed
>removed ninjas_allowed
>pick_n_take() is now more efficient (uses Cut() rather than Remove()


Things I added:

 - Made the pandemic call ..() instead of doing the checks itself.
 - Made the staff of animation use more charge.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5720 316c924e-a436-60f5-8080-3fe189b3f50e

code/controllers/configuration.dm

@@ -38,6 +38,7 @@
 	var/popup_admin_pm = 0				//adminPMs to non-admins show in a pop-up 'reply' window when set to 1.
 	var/Ticklag = 0.9
 	var/Tickcomp = 0
+	var/allow_holidays = 0				//toggles whether holiday-specific content should be used
 
 	var/list/mode_names = list()
 	var/list/modes = list()				// allowed modes
@@ -344,7 +345,7 @@
 					config.popup_admin_pm = 1
 
 				if("allow_holidays")
-					Holiday = 1
+					config.allow_holidays = 1
 
 				if("useircbot")
 					useircbot = 1