don't write row.names

[wibeasley]

avoids the errors like the one below. I hand-tested all of them except for the BOD and H2 examples.

Error in connection_import_file(conn@ptr, name, value, sep, eol, skip) :
  RS_sqlite_import: D:/Users/Will/Documents/tmp.csv line 2 expected 1 columns of data but found 2