fix string encoding errors in UIDs
display UID if abstract syntax is unknown
catch null reference exceptions if connection is aborted
fix extraction of embedded overlays in transcoder
use number keys to change window/level calculation method in dump utility
use H key to show/hide overlays in dump utility
handle min/max calculation of solid black images
account for padding in histogram calculation
update changelog
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into portable

Conflicts:
	DICOM/Imaging/DicomImage.cs
	DICOM/Imaging/DicomOverlayData.cs
Added Histogram to Phone and Store projects