[BitBucket user: Alain Mazy]
[BitBucket date: 2017-05-10.20:55:46]

done in a branch here with multiple other tags following PS 3.15 Table E 1.1: https://hg.orthanc-server.com/orthanc/changeset/c6defdc4c611fca2ab528ba2c6937a742e0329a8

@sjodogne : integration tests are still ok after this change.

A few TODOs to discuss: 
- according to the PS3.15, Study/Series Date/Time shall be 'nulled' .  This might break some stuffs.  And, BTW, I'm not sure what we should use as a 'null' date value
- PatientSex shall be 'nulled' too ...

Once these 5 fields are removed, the integration tests are still ok but this could break stuffs in some users workflows -> to be documented as a potentially breaking change ?

@salimkanoun I think you're kind of anonymization expert.  Do you think we should also remove these 5 tags ?