src/awget.scm (daemonize): Fix wrong slot name for awgetd.
src/wget.scm: Improve wget configuration.

* src/wget.scm (<wget>): Add `logfile' slot.
  (initialize): Create default wget configuration file if it does
  not exist.
  (make-default-config): New method.
  (get-url): Remove extra checks.
* src/awgetd.scm (run-awgetd): Move creation of wget instance
  here.  Set wget options.
  (initialize): Update.