Bug fixes for S4S Imaging Demo#7

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abjonnes wants to merge 6 commits intoRSNA:masterfrom

sync-for-science:master

Commits on Nov 27, 2018

Add `Authorization` to the list of allowed CORS headers
abjonnes
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Commits on Nov 29, 2018

Fix header passthrough on DICOM forwarding (0th header key may be null when the 0th header value is the HTTP status line)
abjonnes
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Forward 503 errors instead of swallowing them silently
abjonnes
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Commits on Dec 10, 2018

Add different types of DICOM data to smart-1288992 dataset (a multiframe DICOM instance; a study of six series with multiple instances each)
abjonnes
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Commits on Jan 3, 2019

Add referring physician to one of the DICOM files
abjonnes
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Commits on Jan 4, 2019

Return only `alphabetic` representations in PN data types
abjonnes
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