By the time you read this, I'll be tossing the last few items into my suitcase and heading for the airport. Today I fly to Panama to attend the Live & Invest in Panama conference, followed by a week exploring the country. This is the culmination of a decision made in January, just a couple of months ago. But in another respect, it's the culmination of nearly five years of research and planning. That's about when I started reading some of the expat websites and thinking about retiring …