Merge pull request #791 from patrickatamaniuk/security/redmineupdate

Security/redmineupdate 2.2.1, 2.1.6, 1.4.6
Merge pull request #790 from patrickatamaniuk/ui/redmineheaders

Visual integration of backlogs and redmine: add option to show redmine headers in backlogs pages
fix jquery namespace issues, update to 1.7.2-ui-1.8.21

avoid loading of backlogs jquery on redmine views for redmine >= 2.1
documented working of ajax test, still working
drop handling: select only sortables for enable/disable for jquery-ui-1.9