Changed Enumerations to use a Single Table Inheritance

* Added migrations to change Enumerations to an STI relationship
* Added TimeEntryActivity model (STI)
* Added DocumentCategory model (STI)
* Added IssuePriority model (STI)
* Added Enumeration#get_subclasses to get a list of the subclasses of Enumeration
* Changed Enumeration to use the STI type field instead of the opt field
* Changed Enumeration#opt to return the old opt values but with a deprecation warning.
* Removed Enumeration::OPTIONS
* Removed the dynamic named_scopes in favor of specific named_scopes.  Kept for
  compatibility reasons.
* Added Enumeration#default so each subclass can easily find it's default record.
* Fixed Enumeration#default to use the STI scoping with a fake default scope for finding Enumeration's default.
* Added a 'all' named scope for getting all records in order by position.
* Added Deprecation warnings to the old named_scopes in Enumerations.
* Moved various methods off of Enumeration and onto the concrete classes
* Changed the EnumerationsController to use types
* Updated the Enumeration list template
* Added has_many relationships to the Enumeration STI classes.
* Fixes for tests.

  #3007

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2777 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/reports_controller.rb

@@ -37,7 +37,7 @@ class ReportsController < ApplicationController
       render :template => "reports/issue_report_details"
     when "priority"
       @field = "priority_id"
-      @rows = Enumeration.priorities
+      @rows = IssuePriority.all
       @data = issues_by_priority
       @report_title = l(:field_priority)
       render :template => "reports/issue_report_details"   
@@ -68,7 +68,7 @@ class ReportsController < ApplicationController
     else
       @trackers = @project.trackers
       @versions = @project.versions.sort
-      @priorities = Enumeration.priorities
+      @priorities = IssuePriority.all
       @categories = @project.issue_categories
       @assignees = @project.members.collect { |m| m.user }
       @authors = @project.members.collect { |m| m.user }
@@ -130,7 +130,7 @@ private
                                                   p.id as priority_id,
                                                   count(i.id) as total 
                                                 from 
-                                                  #{Issue.table_name} i, #{IssueStatus.table_name} s, #{Enumeration.table_name} p
+                                                  #{Issue.table_name} i, #{IssueStatus.table_name} s, #{IssuePriority.table_name} p
                                                 where 
                                                   i.status_id=s.id 
                                                   and i.priority_id=p.id