Search engine: issue custom fields can now be searched.

Each issue custom field (excepting numeric, date and boolean fields) can be marked as "Searchable" (default to false).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@994 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/086_add_custom_fields_searchable.rb

@@ -0,0 +1,9 @@
+class AddCustomFieldsSearchable < ActiveRecord::Migration
+  def self.up
+    add_column :custom_fields, :searchable, :boolean, :default => false
+  end
+
+  def self.down
+    remove_column :custom_fields, :searchable
+  end
+end