HDA dataset issues

hda_sample_train_data could be increased

Person 72 appears fully visible in camera 56 in frame 259 and is not in the hda_sample_train_data
Person 78 appears fully visible in camera 56 in frame 12 and is not in the hda_sample_train_data

It seems that since those two people are people that at the time needed to have their face blurred out, at the time they were not added to the training set.

It's probably not a good idea to change (add) stuff to hda_sample_train_data now, since there is already published results with this 250 image training set

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Ped 17 on Cam 57 in frames 426 and 427 is unoccluded (but marked occluded in the annotations, and in the allD files..., and has the masks...)