Since previous timezone update (see MDL-12024), there are a bunch of changes in Argentina and Chile.

Current timezones package is tzdata2008a ( downloaded from ftp://elsie.nci.nih.gov/pub ).

Details of changes can be tracked at http://www-1.ibm.com/support/docview.wss?rs=3068&context=SSNVBF&uid=swg27008911

The olson.txt to be imported is the concatenation, in one unique file of this olson files (in this exact order):

africa, antarctica, asia, australasia, europe, northamerica and southamerica