NTS: config and initialization

[Hal Murray]

The client side is easy: just add "nts" to the server line.  There are no 
parameters needed so the initialization for the client side just works.

That assumes the certificates for the servers you want to use are covered by 
the default root certificates on your system.

------

For the server side, we have "nts enable".  We should probably change that to 
"nts enable-server".

The server side needs 3 files:
  server certificate
  private key for the certificate
  the keys to make/decode cookies

Currently, it crashes if it can't get the certificate or private key.

I'll set things up so it will create the cookie key file if it can't read it.  
That's easy to change.


-- 
These are my opinions.  I hate spam.