* Makefile.in, configure.in, chkpwd.c, acconfig.h: support for

    * Makefile.in, configure.in, chkpwd.c, acconfig.h: support for
          `chkpwd', a setuid helper program for machines which use shadow
          passwords (configure --enable-chkpwd)
        * Makefile.in, configure.in, auth.c, citadel.pam, user_ops.c: support
          for PAM or shadow passwords (configure --with-pam)
        * Makefile.in: made some messages simpler
        * citadel.spec: updated for 5.53; correct name of tarball; build with
          --enable-chkpwd and --with-pam; add defattr tags so rpm's can be
          built by non-root user
        * commands.c: cosmetic cleanup
        * config.c: (security/paranoia) check permissions on citadel.config