Review all calls to os.stat and ensure they can handle the returned 64-bit integers

[jjr8]

The Python os.stat method returns a 64-bit integer for the file size. This is good because occasionally GIS data files get very large -- greater than the 2 GB limit that would be imposed if file sizes were restricted to the range of 32-bit signed integers. I need to review all GeoEco? code to ensure calls to os.stat are expecting the 64-bit integer.