Unsure why we didn't have one before.

This should be the last merge of develop. I've gone off the two branch model.

Re #313

[skip ci]

(same as RequirePermission but uses pemission methods on permissions sub-object of model instance)

Instead of bundling all functionality into a model we can compose via adding sub-objects; such as PerformedLessonPermissions. This allows the following: pl.permissions.can_view.

Add flash messages
Fix context vars on PL create
Fix hiding of notes when PL is in planned state

[skip ci]

Triggering lesson modals when going back to trainee view

Re. b4335e09 #300

Pushed a fix to the project, stil waiting on the maintainer to merge.

C/P from hotfix

Merge branch 'hotfix/geoposition-field'