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

test/functional/issues_controller_test.rb

@@ -715,7 +715,7 @@ class IssuesControllerTest < Test::Unit::TestCase
            :id => 1,
            :issue => { :status_id => 2, :assigned_to_id => 3 },
            :notes => 'Assigned to dlopper',
-           :time_entry => { :hours => '', :comments => '', :activity_id => Enumeration.activities.first }
+           :time_entry => { :hours => '', :comments => '', :activity_id => TimeEntryActivity.first }
     end
     assert_redirected_to :action => 'show', :id => '1'
     issue.reload
@@ -753,7 +753,7 @@ class IssuesControllerTest < Test::Unit::TestCase
       post :edit,
            :id => 1,
            :notes => '2.5 hours added',
-           :time_entry => { :hours => '2.5', :comments => '', :activity_id => Enumeration.activities.first }
+           :time_entry => { :hours => '2.5', :comments => '', :activity_id => TimeEntryActivity.first }
     end
     assert_redirected_to :action => 'show', :id => '1'