Fixed 3 double-escaped EL functions
EL fn for displaying AssPckg file name removed

This became redundant after recent changes to the
AssessmentPackage entity, so simpler to get rid.
URL of my hosted QTIWorks installs updated.

The final 1.0 release will use webapps.ph.ed.ac.uk/... instead of
www2.ph.ed.ac.uk/... in future. The old address will continue to be
supported so that existing LTI links don't break; though visits to
the static parts of the site will redirect to the new domain if
not there already.
Tidied up the anonymous MVC URLs a bit

* The anonymous MVC now answers to /anonymous instead of /web/anonymous
* The URL of the samples list has been somplified.
* I've added a temporary legacy MVC to cater for Uniqurate, which will
use the old address for now.
Removed unused JSON stuff
Added very simple REST-like assessment runner
Tidied up legacy UQ controller
Ack - reinstanted JSON stuff for candidate MVC

I forgot that this was required for the mathEntryInteraction
feedback. So restored now, but only for the candidate MVC