Issue627ModalityBugImpax

Whether tag modality is used in study-request is configurable per query-node.

Special comment concerning the study_rsp.save() in qrscu.py:
the .save() really seems necessary(see #626).
Log without study_rsp.save():
[27/Jun/2018 10:27:20] DEBUG [remapp.netdicom.qrscu:827] Pruning series responses
[27/Jun/2018 10:27:20] INFO [remapp.netdicom.qrscu:157] Deleting series we can't use
[27/Jun/2018 10:27:20] DEBUG [remapp.netdicom.qrscu:170] at study in study_resp in series prune. modalities in study are: [u'']
...
[27/Jun/2018 10:27:21] DEBUG [remapp.netdicom.qrscu:857] Study: CT WETENSCHAP 16004 TX + ABD BMS CA209-274 I.V. CONTRAST (<STUDY_UID>) modalities: [u''], Series: <SERIES_UID>, modality: CT containing 501 objects.
<AND MANY MORE SERIES FROM THIS STUDY>

Log with study_rsp.save():
[27/Jun/2018 10:29:52] DEBUG [remapp.netdicom.qrscu:827] Pruning series responses
[27/Jun/2018 10:29:52] INFO [remapp.netdicom.qrscu:157] Deleting series we can't use
[27/Jun/2018 10:29:52] DEBUG [remapp.netdicom.qrscu:170] at study in study_resp in series prune. modalities in study are: [u'SR', u'CT']
...
[27/Jun/2018 10:30:05] DEBUG [remapp.netdicom.qrscu:857] Study: CT WETENSCHAP 16004 TX + ABD BMS CA209-274 I.V. CONTRAST (<STUDY_UID>) modalities: [u'SR', u'CT'], Series: <SERIES_UID>, modality: SR containing 1 objects.
<THIS IS THE ONLY SERIES FROM THIS STUDY>
So without .save() modalities in study stay empty. With .save() they are filled.

Updated change lists and documentation.