All records from the same business entity should be updated when SCD1 fields change

[rfvoltolini]

When extracting a Dimension record, and a SCD1 field changes, the Extractor class should reflect these changes on all records from the same business entity.

Example:
Suppose the following patient_dimension at the DW where patient_name is SCD1 and patient_weight is SCD2:

patient_sk	patient_bk	patient_name	patient_weight	valid_from	valid_until
32145	101	Joseph Cliver	78 Kg	1900-01-01 00:00:00	2016-02-20 12:44:58
35158	101	Joseph Cliver	83 Kg	2016-02-20 12:44:58	2100-12-31 23:59:59

If a new record is extracted where the only changes are on SDC1 fields, all DW records for the same business entity should be updated. No new record should be created at the DW.

Ex, Joseph Cliver changes his name to J. Cliver:

patient_sk	patient_bk	patient_name	patient_weight	valid_from	valid_until
32145	101	J. Cliver	78 Kg	1900-01-01 00:00:00	2016-02-20 12:44:58
35158	101	J. Cliver	83 Kg	2016-02-20 12:44:58	2100-12-31 23:59:59

If both SDC1 and SCD2 fields changes, a new record needs to be created, and all other fields from the same business entity should have it's SDC1 attribute updated:

Ex. J. Cliver change his name to JC and gets fatter:

patient_sk	patient_bk	patient_name	patient_weight	valid_from	valid_until
32145	101	JC	78 Kg	1900-01-01 00:00:00	2016-02-20 12:44:58
35158	101	JC	83 Kg	2016-02-20 12:44:58	2016-04-01 22:18:12
45855	101	JC	88 Kg	2016-04-01 22:18:12	2100-12-31 23:59:59