Remove duplication of styles, add extra header blocks

Update the example django project styles to avoid duplication of styles
defined by tillweb

Add a new "jquery" block to the header so the tillweb can override
jquery scripts and stylesheets.
Fix login_required for integrated version of tillweb
Oops - be careful reading TILLWEB_LOGIN_REQUIRED
Augh!  Fix typo in tillweb!
Grr, avoid name clash
Remove defaults from timesheets API

They were out of date anyway!  All the users specify them in full in the
configuration files already.
Enable suppression of total on customer food order tickets

Also print name of user who took the order on kitchen copy of ticket
Check for lack of user before using name

This only happens in the "foodcheck" page.
quicktill 0.10.22