"Extra data" doesn't export or import

[GoogleCodeExporter]

Using Mileage 3.1.1 on a Droid Bionic running Android 4.2.2.

On the "Fillup" tab, there's a field for "Extra data" (prefilled with 
"Comment").  I occasionally enter data in there, but when I do an export as a 
CSV, that field isn't present.

When I try adding that field to the CSV (I title it "Extra data"), it isn't 
recognized by the import tool.  It asks me to select a field, but there isn't 
one listed that corresponds to the comments.

I'm not sure if this is a bug or there's a reason that comments aren't backed 
up.

Thanks!

Original issue reported on code.google.com by averageb...@gmail.com on 25 Jun 2013 at 2:28