Copyright notice update and RELEASE_STATUS package creation changes.

	Copyright notice update and RELEASE_STATUS package creation changes.

	* LICENSE: Update copyright notice adding year 2013.
	* README: Update copyright notice adding year 2013.
	Add text to explain where release notes can be found.
	* Makefile.in: Update copyright notice adding year 2013.
	(mingwrtdocdir): New variable used in dist-mingwrt target.
	(w32apidocdir): New variable used in dist-w32api target.
	(doc_DOCUMENTS): Add ChangeLog, NEWS, TODO, and NOTES.
	(install-mingwrt-dirs, install-w32api-dirs): Correct creation of doc
	directory using mingwrtdocdir or w32apidocdir respectfully.
	(install-mingwrt, install-w32api): Correct copy of historical
	documentation.
	(dist-mingwrt*, dist-w32api*): For RELEASE_STATUS != prod modify the
	package name to include the RELEASE_STATUS to satisfy the rules of
	mingw-get.