bin/map, db_xml.put_table() (row-based and column-based import): Don't sort the input table by its pkey, in order to support input tables with no pkey. Note that reading the input table in table order and having this match the input flat file's order is only possible with sql_io.import_csv()'s truncation of the table on a failed import, which ensures that the rows will be stored in inserted order.

sql_io.py: import_csv(): Only do the import in a savepoint if using COPY FROM, to allow autocommits after each insert and thus make rows visible immediately after they are inserted

db_xml.py: put_table(): Subsetting in_table: Add a row number column if in_table does not already have a pkey

db_xml.py: put_table(): Subsetting in_table: Copy all of in_table's structure, rather than just the column types, by using sql.copy_table_struct() and sql.insert_select(). This preserves pkeys and NOT NULL constraints, which are useful for column-based import.

db_xml.py: put_table(): Subsetting in_table: Create in_table as a completely new sql_gen.Table instead of copying full_in_table and relying on sql.run_query_into() to set is_temp and remove the schema

sql.py: add_row_num(): Use if_not_exists in order to abort if the column already exists rather than adding a version #

sql.py: add_col(): Added if_not_exists param to abort if the column already exists rather than adding a version #

db_xml.py: put_table(): Removed no longer accurate comment that full_in_table will be shadowed (hidden) by the created temp table. (The temp table is now named differently, so the shadowing does not occur.)

db_xml.py: put_table(): Replaced no longer accurate Recurse comment with Import data. Rewrapped lines.

sql_io.py: import_csv(): Factored insertion code out into new append_csv()