Placed inputs/SpeciesLink/_archive/ under version control

input.Makefile: $(import?): Renamed $public_import option to $full_import because it applies to any import of all datasources, not just a public import on vegbiendev

schemas/vegbien.sql: analytical_stem_view: Changed `WHERE COALESCE` to a join condition to enable using the taxondetermination_single_current_determination index, which produces the filtered rows directly. Note that this index will not be used for full-database imports, because the query planner uses hash joins everywhere instead of nested loops.

db_xml.py: put_table(): Fixed bug where for views, shouldn't advance start (OFFSET clause) after each chunk, because views are typically dynamic and will contain a new set of rows after the first set is imported

sql.py: Added view_exists()

inputs/.TNRS/schema.sql: Removed no longer used tnrs_canon. unscrubbed_taxondetermination_view uses its definition directly instead.

schemas/vegbien.sql: unscrubbed_taxondetermination_view: Added comment from tnrs_canon

schemas/vegbien.sql: unscrubbed_taxondetermination_view: Added comment from tnrs_canon

schemas/vegbien.sql: unscrubbed_taxondetermination_view: Do the tnrs_canon joins manually instead of using tnrs_canon, to allow PostgreSQL to use a nested loop join on just the needed tnrs rows instead of a hash self-join of all tnrs rows. The query planner is not yet advanced enough to automatically integrate the select on the view into the top-level joins list, which would make this change automatically.

inputs/.TNRS/public.unscrubbed_taxondetermination_view/scrub.make: rowsAdded(): Look at last 100 rows instead of last 10, because rows are added to the log file each time the script waits and the Inserted # new rows message must be in the tailed rows