Added migration to restore default column values that were lost in the migration
from MySQL to PostgreSQL.  This fixes the bug noted in redmine task #2352 by
setting default 'checked' values to 0.
Updated production structure file.
Merge branch 'master' into BulkUpload1920
Now that existing_treatment? raises an exception when a treatment lookup fails
instead of returning nil, update validate_csv_data to catch it.
Modified layout of display_csv_file so that the data table is centered.