Added an active field track if an Enumeration is active on the frontend view.

* Changed TimelogHelper#activity_collection_for_select_options to only use
  active TimeEntryActivities.
* Changed TimelogHelper#activity_collection_for_select_options to return a blank
  option if the time_entry's current activity is inactive.

  #4077

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2946 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/enumerations/_form.rhtml

@@ -6,6 +6,9 @@
 <p><label for="enumeration_name"><%=l(:field_name)%></label>
 <%= text_field 'enumeration', 'name'  %></p>
 
+<p><label for="enumeration_active"><%=l(:field_active)%></label>
+<%= check_box 'enumeration', 'active'  %></p>
+
 <p><label for="enumeration_is_default"><%=l(:field_is_default)%></label>
 <%= check_box 'enumeration', 'is_default'  %></p>
 <!--[eoform:optvalue]-->
@@ -13,4 +16,4 @@
 <% @enumeration.custom_field_values.each do |value| %>
 	<p><%= custom_field_tag_with_label :enumeration, value %></p>
 <% end %>
-</div>
+</div>