Replaced repr() with strings.urepr() (or equivalent) everywhere needed, to avoid future UnicodeEncodeErrors

Replaced str() with strings.ustr() (or equivalent) everywhere needed, to avoid future UnicodeEncodeErrors

sql.py: map_expr(): Replacing without quotes: Don't match unquoted name where it's preceded or followed by '.', because this could be a '.' embedded in a punctuation-containing column name, such as those frequently used by column-based import. Note that because database-internal names currently do not contain punctuation, this situation only occurs when a database-internal expression (such as a check constraint condition) is replaced in two steps, and the first step introduces punctuation-containing column names into the expression.

schemas/vegbien.sql: project: Don't require projectname to be specified when sourceaccessioncode is provided

sql_gen.py: ensure_not_null(): If type_ is set, cast the column to it if needed

README.TXT: Data import: Added testing steps to perform on local machine before running the import

README.TXT: Documentation: Redmine-formatted list of steps for column-based import: Updated make command for new table subdir name

sql.py: run_query(): Parse "types cannot be matched" error as MissingCastException to type text

sql_io.py: put_table(): Creating the into table: Fixed bug where in_pkey and out_pkey names would collide if the output and input pkeys have the same name (as is the case for SALVIAS.projects). This entails changing out_pkey to new into_out_pkey wherever the into table's out_pkey is created or referenced.

sql_io.py: put_table(): Combining output and input pkeys in inserted order: Changed sql_gen.Table to sql_gen.Col when creating the column references (they have a similar effect, so using the wrong type did not cause any tests to fail)