tzcode1999d.tar.gz and tzdata1999d.tar.gz

The files ftp://elsie.nci.nih.gov/pub/tzcode1999d.tar.gz and ftp://elsie.nci.nih.gov/pub/tzdata1999d.tar.gz are now available. These include the changes circulated this week on the time zone mailing list by Paul Eggert; the Makefile's "make public" rule has also been changed to do a test compile of each individual time zone data file (which should help avoid problems such as the one we had with Nicosia). --ado