Cosmetic fixes.

2013-06-13  Didier Verna  <didier@didierverna.net>

	* src/util/texi.lisp:
	* src/doc/symbol.lisp: Update files headers.
Fix RENDER-DEFINITION-CORE's bogus docstring.

2013-06-13  Didier Verna  <didier@didierverna.net>

	* src/doc/symbol.lisp (render-definition-core): Don't claim that
        this function renders the docstring.
Make proper definitions for setf expanders.

These definitions are associated with macros or (generic) functions. There's
no documentation merging yet.

2013-06-13  Didier Verna  <didier@didierverna.net>

	* item/symbol.lisp (funcoid-definition): Remove EXPANDER slot.
	(macro-definition):
	(accessor-definition):
	(generic-accessor-definition): Add EXPANDER slot.
	(setf-expander-definition): New structure.
	(lambda-list):
	(category-definitions): New methods for setf expander definitions.
	(add-symbol-definition): Fill EXPANDER slots in macros and
	(generic) function definitions when applicable.
	(finalize-definitions): Resolve short setf expander names to
	proper definitions.
	(name):
	(source):
	(docstring):
	(type-name): New methods for setf expander definitions.
	* src/item/package.lisp (definition-package-definitions):
	* src/item/asdf.lisp (definition-file-definitions): Handle the
	presence of a setf expander in a macro or (generic) function
	definition.
	* src/doc/symbol.lisp (render-@defunoid): Remove setf expander
	code.
	(render-@defsetf): New function.
	(title):
	(index): New methods for setf expander definitions.
	(document (macro)):
	(document (accessor-definition)):
	(document (generic-accessor-definition)): Possibly document a setf
	expander associated with this definition.
	(document (setf-expander-definition): New method.
	* src/declt.lisp (render-header): Define a new Texinfo macro
	@setfexpandersubindex).
Fix two similar bugs in definitions retrieval code.

2013-06-13  Didier Verna  <didier@didierverna.net>

	* src/item/package.lisp (definition-package-definitions):
	* src/item/asdf.lisp (definition-file-definitions): Don't forget
	to pass the last argument (package or file) in the macro methods.