ui/lazycat-gtk.scm: Fix the header comment.
host-list.scm (host-list-add-host): Use keywords for arguments.

* server/scm/host-list.scm (host-list-add-host): Use keywords for
  passing arguments into the procedure.  All callers updated.
* server/scm/lazycatd.scm (lazycat-add): Update.
* server/scm/utils.scm: New file.