PLCgen self-certification test set: the results of the division are not compared correctly

In op_bind_and_prio_num2 and op_bind_and_prio_num3 we test division. The results of these tests are compared by _results_compare_s7.tooldef . However the results aren't compared correctly - see example below and in the file.

_results.txt

    a_add_divide01 -> NOT OK: expecteds_ok=["12.416666666666668", "12.41667"], expecteds_nok=[], actual=12.4166666666667
    a_add_divide02 -> NOT OK: expecteds_ok=["-2.916666666666667", "-2.916667"], expecteds_nok=[], actual=-2.91666666666667

Addresses #1019 (closed), #679, #798 (closed)