Computer tweaks (#1285)

Pulling in some computer changes from bay.

code/modules/modular_computers/file_system/data.dm

@@ -3,6 +3,8 @@
 /datum/computer_file/data
 	var/stored_data = "" 			// Stored data in string format.
 	filetype = "DAT"
+	var/block_size = 250
+	var/do_not_edit = 0				// Whether the user will be reminded that the file probably shouldn't be edited.
 
 /datum/computer_file/data/clone()
 	var/datum/computer_file/data/temp = ..()
@@ -10,7 +12,7 @@
 	return temp
 
 // Calculates file size from amount of characters in saved string
-/datum/computer_file/data/proc/calculate_size(var/block_size = 250)
+/datum/computer_file/data/proc/calculate_size()
 	size = max(1, round(length(stored_data) / block_size))
 
 /datum/computer_file/data/logfile