Fully hooked the Deliverable columns into the filters and Queries

* The Deliverable subject can now be filtered on the issues list
* The Deliverable subject can now be displayed on the issues lists with
  as a default column or part of a saved query
* The issues can be sorted by the deliverable

  #1148

init.rb

@@ -1,6 +1,7 @@
 require 'redmine'
 
 # Patches to the Redmine core.  Will not work in development mode
+require_dependency 'issue_patch'
 require_dependency 'query_patch'
 
 RAILS_DEFAULT_LOGGER.info 'Starting Budget plugin for RedMine'