[#4410] Replace Payment Terms with an Enumeration

Instead of using a hard coded value for Payment Terms, they will use
Redmine's Enumeration table.  This provides an admin gui to managing
the value as well as ordering them.

init.rb

@@ -58,6 +58,8 @@ Dispatcher.to_prepare :redmine_contracts do
 
   Formtastic::SemanticFormBuilder.all_fields_required_by_default = false
   Formtastic::SemanticFormBuilder.required_string = "<span class='required'> *</span>"
+
+  require_dependency 'payment_term' # Load so Enumeration will pick up the subclass in dev
   
   require_dependency 'project'
   Project.send(:include, RedmineContracts::Patches::ProjectPatch)