New HRSC tiles added to Souness Top Trumps

The Souness Martian glaciers Top Trumps page has now been updated to include HRSC tiles that were overlooked in the dissertation, which means that for example Souness 7, 707 and 708 now have gone from partial to complete coverage of their extents.

I have also partially documented the steps in the data processing at bitbucket.org/davidtreth/marsglaciers.