XNAT-3444 Added site admin to test of XDATUser.hasAccessTo().

Changes in xdat jars correspond to changeset https://bitbucket.org/nrg/xdat_1_6dev/commits/040def0fe862dff8d2f9d4840a4ffd75baddb9f7.
XNAT-3444 Added back in check for access constructor flag.
Made verification check work correctly for LDAP accounts whose LDAP usernames are different than their XNAT usernames.