OK, I've solved it. The issue with display_as location remains and I still
have to put the Allow from directives in the / location but I have been able to
get UCSC working again and I'm completely to blame so maybe I should keep quiet
but no, in the spirit of sharing one's idiocy here it is
I've followed the instructions on setting up Apache Authentication (have to
authenticate against an Active Directory server) here
http://wiki.galaxyproject.org/Admin/Config/Apache%20Proxy and it doesn't work
for external display sites unfortunately. The section on display sites
suggests the
