Configuration of da.html

This is the list of all atlases on the server. On installation it will be linked to by ../da.html to be compatible with earlier versions of the atlas software. Initially it is a copy of da_test.html, which provides a link to the Test atlas. Modify this file in the manner of the da-test.html to add new atlases. da_all.html lists all the atlases known so far in case you are hosting one of these.