Add America/Argentina/X (formerly America/X) timezones

[stuartkeith]

Buenos Aires has a number of America/X timezones that are obsolete and should be replaced by America/Argentina/X timezones, e.g. America/Argentina/Buenos_Aires instead of America/Buenos_Aires.

• http://www.timezoneconverter.com/cgi-bin/zoneinfo.tzc?s=default&tz=America/Buenos_Aires
• http://www.timezoneconverter.com/cgi-bin/zoneinfo.tzc?s=default&tz=America/Catamarca
• http://www.timezoneconverter.com/cgi-bin/zoneinfo.tzc?s=default&tz=America/Cordoba
• http://www.timezoneconverter.com/cgi-bin/zoneinfo.tzc?s=default&tz=America/Jujuy
• http://www.timezoneconverter.com/cgi-bin/zoneinfo.tzc?s=default&tz=America/Mendoza

This PR adds the new timezones. It keeps the existing ones for backwards compatibility.