Tzcode2004g.tar.gz and tzdata2004g.tar.gz

The files ftp://elsie.nci.nih.gov/pub/tzcode2004g.tar.gz and ftp://elsie.nci.nih.gov/pub/tzdata2004g.tar.gz are now available. The most important change is the update to Cuba (taking effect this weekend); the other changes circulated yesterday by Paul Eggert are includes, as well as a correction of the spelling of Oslo and changed versions of difftime.c and private.h. --ado