Finalize support for restricted mode option.

Finalize support for restricted mode option.

ChangeLog entries:

2012-02-25  Didier Verna  <didier@lrde.epita.fr>

	* com.dvlsoft.clon.asd (cl-user::com.dvlsoft.clon.configuration):
	DEFVAR it.
	* com.dvlsoft.clon.asd (configuration): Remove check for unbound
	configuration variable.
	* com.dvlsoft.clon.asd (set-configuration): New function. DEFSETF
	it.
	* com.dvlsoft.clon.asd: Protect against absence of SB-GROVEL
	module. Force :restricted configuration when relevant (including
	when the underlying Lisp is ABCL). Push :com.dvlsoft.clon.termio
	onto *FEATURES*, unless in restricted mode.
	* com.dvlsoft.clon.asd (:com.dvlsoft.clon): Conditionalize loading
	of termio module on it.

2012-02-25  Didier Verna  <didier@lrde.epita.fr>

	* termio/termio.lisp (stream-line-width): Remove ABCL reader
	conditionals. This function is not defined at all for ABCL
	because the termio module is not loaded anymore.

2012-02-25  Didier Verna  <didier@lrde.epita.fr>

	* src/output/sheet.lisp (initialize-instance): Check that
	STREAM-LINE-WIDTH is fbounp before calling it (it will be only
	when the termio module is loaded).