Fill in new ASDF 3 system slots.

2013-07-04  Didier Verna  <didier@didierverna.net>

	* com.dvlsoft.declt.asd (:com.dvlsoft.declt): Add MAILTO, HOMEPAGE and
	SOURCE-CONTROL to the system.
Document more ASDF 3 system slots.

2013-07-04  Didier Verna  <didier@didierverna.net>

	* package.lisp (:com.dvlsoft.declt): Import more ASDF 3 slot
	accessors from ASDF.
	* src/doc/asdf.lisp (document (asdf:system)): Document the MAILTO,
	HOMEPAGE, SOURCE-CONTROL and BUG-TRACKER.
Document ASDF systems'defsystem dependencies.

2013-07-04  Didier Verna  <didier@didierverna.net>

	* src/util/misc.lisp (defsystem-dependencies): New function.
	* src/doc/asdf.lisp (document (asdf:component)): Use it to
	document a system's defsystem-depends-on.