sql_io.py: cast_temp_col(): Name the new column with only the first word of the type, to save space in the limited identifier length

strings.py: Added first_word()

sql_io.py: cast_temp_col(): Use sql_gen.suffixed_col() to create the new column name

inputs/import.stats.xls: Added run time for SALVIAS organisms, which just finished

inputs/import.stats.xls: Use [1]-style footnotes because copying and pasting to Gmail doesn't preserve the superscripts

inputs/import.stats.xls: Updated for latest simultaneous column-based import

sql_io.py: cast_temp_col(): Don't automatically create an index on the new column, because it doesn't necessarily need an index and the main index used for the join is now added automatically by distinct_table()

sql.py: flatten(): Don't automatically create indexes on all columns, because most columns don't need indexes and the main index used for the join is now added automatically by distinct_table()

sql.py: Removed no longer needed add_index_col() and ensure_not_null() because we are not using index columns

sql.py: add_index(): Don't create index columns for nullable columns, because they require indexes to be created on all columns in order to use a distinct_table() temp table. Also, now that we are no longer using LEFT JOINs, the COALESCE call would only be evaluated once (in the plain JOIN) in the event that PostgreSQL doesn't use an index on a COALESCE expression.