* lib.scm: Move module the system directives `export',

* lib.scm: Move module the system directives `export',
  `export-syntax', `re-export' and `re-export-syntax' into the
  `define-module' form.  This is the recommended way of exporting
  bindings.

* srfi-2.scm, srfi-4.scm, srfi-8.scm, srfi-9.scm, srfi-10.scm,
srfi-11.scm, srfi-14.scm, srfi-16.scm: Move module the system
directives `export', `export-syntax', `re-export' and
`re-export-syntax' into the `define-module' form.  This is the
recommended way of exporting bindings.

* goops.scm, goops/active-slot.scm, goops/compile.scm,
goops/composite-slot.scm, goops/describe.scm, goops/dispatch.scm,
goops/old-define-method.scm, goops/save.scm, goops/util.scm: Move
module the system directives `export', `export-syntax',
`re-export' and `re-export-syntax' into the `define-module' form.
This is the recommended way of exporting bindings.

* slib.scm (array-indexes): New procedure.
(*features*): Extend.  (Probably some of these options should be
set elsewhere.)  (Thanks to Aubrey Jaffer.)

* and-let-star-compat.scm, and-let-star.scm, calling.scm,
  channel.scm, common-list.scm, debug.scm, debugger.scm,
  expect.scm, hcons.scm, lineio.scm, ls.scm, mapping.scm,
  null.scm, optargs.scm, poe.scm, popen.scm, pretty-print.scm,
  q.scm, r5rs.scm, rdelim.scm, regex.scm, runq.scm, safe-r5rs.scm,
  safe.scm, session.scm, slib.scm, streams.scm, string-fun.scm,
  syncase.scm, threads.scm: Move module the system directives
  `export', `export-syntax', `re-export' and `re-export-syntax'
  into the `define-module' form.  This is the recommended way of
  exporting bindings.