danielmwatkins/ice-floe-validation-dataset: v0.2

Series of minor updates, including minor changes to floe masks to correct errors and contacting floes. Main change is the addition of ice floes which lie along the image boundaries. In the property tables, a new "boundary" column allows these floes to be removed for shape statistics, while keeping them for pixel statistics. Additionally, the case notes were split from the validation CSV file and floe statistics were added to the table.