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/views/enumerations/list.rhtml

@@ -1,9 +1,9 @@
 <h2><%=l(:label_enumerations)%></h2>
 
-<% Enumeration::OPTIONS.each do |option, params| %>
-<h3><%= l(params[:label]) %></h3>
+<% Enumeration.get_subclasses.each do |klass| %>
+<h3><%= l(klass::OptionName) %></h3>
 
-<% enumerations = Enumeration.values(option) %>
+<% enumerations = klass.all %>
 <% if enumerations.any? %>
 <table class="list">
 <% enumerations.each do |enumeration| %>
@@ -20,7 +20,7 @@
 <% reset_cycle %>
 <% end %>
 
-<p><%= link_to l(:label_enumeration_new), { :action => 'new', :opt => option } %></p>
+<p><%= link_to l(:label_enumeration_new), { :action => 'new', :type => klass.name } %></p>
 <% end %>
 
 <% html_title(l(:label_enumerations)) -%>