UI part.

Add a drop down to allow to specify the date format in the file.

A bit bodgy, need to refactor existing fileupload to allow additional
fields to be passed. Also 'selected' format is stored in a hidden field
to allow the existing upload code to be used. Might be better to
refactor that to suck info from the app/local state to populate the form
POST. something for another day.
server side of csv upload - handles dates better.
Merge pull request #186 from MastodonC/feature/fix-csv-upload-with-aliases

Feature/fix csv upload with aliases
fix the example for add-user.