v2.3.1

This release addresses 3 minor bugs and 1 extra feature. The 3 bugs are 1) a mistake for the file conversion that lost the comments for each property, 2) the inability to add a new property to an existing file, and 3) the inability to add a new fuel or maintenance record at the end of the list. The extra feature brings the fuel log (if open or minimized) to the front after closing a fuel editor.