tzcode1998d.tar.gz and tzdata1998d.tar.gz

The files ftp://elsie.nci.nih.gov/pub/tzcode1998d.tar.gz and ftp://elsie.nci.nih.gov/pub/tzdata1998d.tar.gz are now available. The only differences between these and the 1998c files are changes to comments (in particular, elimination of references to CIA maps). "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places where changes occur. --ado