Massive renaming of tables and columns

The original mussels database was incredibly confusing because all the
tables were poorly named (i.e. the substrate table was called "types"
and species were called "statues". It's been driving me crazy, so I
finally renamed everything, and rebuilt all the tables. I also imported
everything from the "display_view" view into the new "observation" table
making the display_view view obsolete.