Revision 1373

Backport from HEAD

* Thuban/Model/table.py (_find_dbf_column_names): New. Helper
function for table_to_dbf
(table_to_dbf): Deal with names longer than the 10 character limit

* test/test_dbf_table.py (TestTableToDBF.test_table_to_dbf): Add
doc-string
(TestTableToDBF.test_table_to_dbf_long_col_names): New test for
long column names