Yet another test_select package update

Most recent version here(updated).

Added these two:

display_results(test_name,compared_to_test_name) - output results of
testings in the two scenarios.  List results from all queries that
ran more than 3 times as long with one test or the other.  Also 
summarize results with total elapsed time, number of queries 
executed, average elapsed time, and percent improvement.

show_plan(test_name,sqlnumber) - extract plan from plan_table for
given test name and sql statement.

Example usage:

execute test_select.display_results('PARALLEL 128','PARALLEL 8');

select test_select.show_plan('PARALLEL 128',57) from dual;

Give it a try.

– Bobby