Update for recent ASDF.

2013-06-20  Didier Verna  <didier@didierverna.net>

	* version.cl:
	* doc/generate.cl:
	* src/declt.lisp (declt): Use LOAD-SYSTEM instead of OPERATE.
	* package.lisp (defpackage (:com.dvlsoft.declt)): Import
	COMPONENT-LOAD-DEPENDENCIES from ASDF. Replace
	SYSTEM-DEFINITION-PATHNAME with SYSTEM-SOURCE-FILE.
	* src/util/asdf.lisp (system-base-name):
	(system-file-name):
	(system-file-type):
	* src/item/asdf.lisp (lisp-pathnames): Use SYSTEM-SOURCE-FILE
	instead of SYSTEM-DEFINITION-PATHNAME.
	* src/doc/asdf.lisp (document (component)): Compute dependencies
	with COMPONENT-LOAD-DEPENDENCIES. Use SYSTEM-SOURCE-FILE instead
	of SYSTEM-DEFINITION-PATHNAME. Remove ASDF 1 code about
	installation / source directory.
	* src/doc/doc.lisp (render-source):
	(add-files-node):Use SYSTEM-SOURCE-FILE instead of
	SYSTEM-DEFINITION-PATHNAME.