In case the column is not found.
Ability to group and sort the issue list by user/version custom field (#9419).
Adds Version.fields_for_order_statement.
Adds CustomField#group_statement.
Use JQuery Dialog (#11445).
Use JQuery Datepicker (#11445).
JQuery in, Prototype/Scriptaculous out (#11445).
Fixed that settings raises an error if not trackers exist (#11467).
code layout cleanup lib/redmine/helpers/gantt.rb
replace tabs to spaces and fix indents at lib/redmine/helpers/gantt.rb
