Made AliasToken secret a 64 char random String.

src/main/java/org/nrg/pipeline/XnatPipelineLauncher.java

...java/org/nrg/xnat/restlet/services/AliasTokenRestlet.java

...xnat/security/alias/AliasTokenAuthenticationProvider.java

...rg/xnat/security/alias/AliasTokenAuthenticationToken.java

...org/nrg/xnat/turbine/modules/screens/InactiveAccount.java

...g/xnat/turbine/modules/screens/XDATScreen_UpdateUser.java