Added latest drafts for 1966-1985 (April 4 drafts)

The latest drafts for 1961-1963 and 1966-1985 are now the April 4
drafts.
The latest drafts for 1964 and 1965 are the "no headers" drafts.
1964 and 1965 will be updated to "April 4 status" soon.
Added an "obsolete files" folder.