Clean up the ICC datasheet and dataset

[twelch]

• remove fields from the datasheet that aren't on the paper form (location id, watershed id, ...)
• this also means removing columns from the spreadsheet data itself that aren't on the paper form. We're trying to create a one-to-one here.
• the field names are not very readable in the report tab. 'Pounds trash beach' for example. That's the most important value probably to people and it doesn't read well. Of course it's beach and we know it's unit type is pounds already, so just label it total 'Total estimated weight collected'