When attaching the handler to the select element, restrict it by name
to 'DataTables_Table_0_length' so that it doesn't get triggered by the
select dropdowns on the traits and yields pages that update the values
for QA/QC and Access level.

This fixes Redmine issue #1947.
Unset the id attribute for the select element having name
"DataTables_Table_0_length".  "DataTables_Table_0_length" is already
used as the id of the smallest containing div.