Review seamark.yml and planet data: pass 1 of 2

[erictheise]

Now that we have a current planet file and a few weeks' experience with the data, let's ensure that the simple schemas are correct for each seamark object and that there's data flowing into where it should be.

This issue is for single table objects, not ones that require has-many relations to represent "ownership" or co-location of objects, e.g., signals on a a beacon. Separate master issue for that which will address several outstanding issues.