ssh/server-type.c (print_server): Print object address
ssh/server.scm (server-get): New procedure

* ssh/server-func.c (guile_ssh_server_get): New procedure.
* ssh/server.scm (server-get): Export.
* tests/server.scm ("server-get"): New TC.
* doc/api-servers.texi (Servers): Add description of `server-get'.
* NEWS: Update.