Changes in version generation script.
Changed authentication to cookies.

The subparticipant have to authenticate to the ECS with traditional
cookies (like any anonymous participant). Keep in mind that a
subparticipant has to honor any "Set-Cookie:..." HTTP header, i.e. he
must update his cookie with the one provided in "Set-Cookie:".
Security for subparticipants.

Subparticipants don't use peer authentication. Instead they use cookies.