FIX: Anonymize names of non-UID tags

[bpycinski]

Currently gdcmanon does not create dummy names of Patient's Name, Patient ID, Study ID and Series Number, despite of these tags are explicitly listed to be prevented (see gdcmAnonymizer.cxx lie 761 and 804-809). This commit fixes incoplete initialization of a dictionary dummyMapNonUIDTags.

Behavior of gdcmanon --de-identify before the patch:

$ gdcmdump outfile_orig | grep -E '0010,0010|0010,0020|0020,0010'
(0010,0010) PN (no value)                                         # 0,1 Patient's Name
(0010,0020) LO (no value)                                         # 0,1 Patient ID
(0020,0010) SH (no value)                                         # 0,1 Study ID

After the patch:

$ gdcmdump outfile_patch | grep -E '0010,0010|0010,0020|0020,0010'
(0010,0010) PN [3b304717c479a4272b707048dbe7ee63]                 # 32,1 Patient's Name
(0010,0020) LO [5d82026296e8b502d8eb9c5fa87d5b12]                 # 32,1 Patient ID
(0020,0010) SH [a569398d13eb87b14276380d2921ddbc]                 # 32,1 Study ID

[malaterre]

@bpycinski Thanks for the reminder ! The reason I am not merging this directly is that I never liked the fact that I was producing invalid content for some Value Representation. I vaguely even recall reporting a bug about that saying something like: 'we need a better random generator, one for each VR'. So I'll leave this PR aside for now. Thanks.

[bpycinski]

Salut Mathieu! Thank you for your explanation. The comments in the source as well as the presence of unnecessary variable DummyMapNonUIDTags did mislead me, so I assumed that it had been a bug. But now it is clear to me.