DRRPP: fix missing component, Fix LA prepop (some 'L3s' were really L4s),
minor cleanup of XLS codec, progress LocationSelector2
Fix to bespoke dataTables to ensure that they sort correctly.
Use roles to restrict the guided tours.
Merge pull request #553 from graeme-f/master

Fix to bespoke dataTables to ensure that they sort correctly when displayed
Leaner left-join handling in datatable_filter.