Simple time tracking functionality added. Time can be logged at issue or project level.

There's no aggregation reports for now, it's just possible to see all time entries for a project or an issue.
A new "activities" enumeration is added.
Permission for a role to log time must be set (new "Time tracking" section in role permissions screen).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@368 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/enumeration.rb

@@ -24,7 +24,8 @@ class Enumeration < ActiveRecord::Base
 	
 	OPTIONS = {
 	  "IPRI" => :enumeration_issue_priorities,
-      "DCAT" => :enumeration_doc_categories
+      "DCAT" => :enumeration_doc_categories,
+      "ACTI" => :enumeration_activities
 	}.freeze
 	
 	def self.get_values(option)
@@ -42,6 +43,8 @@ private
       raise "Can't delete enumeration" if Issue.find(:first, :conditions => ["priority_id=?", self.id])
     when "DCAT"
       raise "Can't delete enumeration" if Document.find(:first, :conditions => ["category_id=?", self.id])
+    when "ACTI"
+      raise "Can't delete enumeration" if TimeEntry.find(:first, :conditions => ["activity_id=?", self.id])
     end
   end
 end