Download Form Changes

1. Dropped the HUC option
2. Added "Select a Station Name" - placed this box below "State"
3. Changed "Select a Constituent Value Type" to "Select a Water Quality Data Type"
4. Changed the data selection format
5. Put options into a box like others.
6. Added a lead - "Choose data type (s):"
7. Removed the words data and only
8. Removed benchmark values option
Ah, sorry. The github diff folds the code. I didn't see that. mah bad.