Merge branch 'develop' into release/5.6
dontFilterQueryStudiesForUniqueInstanceUID: keep the study with the highest number of images.
Faster study/series/delete function: only ONE save
MD-147
DCMView: out of bounds memory error
MD-148

ScreenCapture with retain screens bug
MD-150
MD-154
KBDelayedPopUpButtonCell
MD-155
MD-155
MD-155
MD-97
MD-157

When reloading the series, restore the same DicomImage position if
possible
GUI Cleaning
Merge branch 'release/5.6' into develop
Merge
viewer thumbnails: stop displaying HIDE SERIES on a partially loaded study, when clicking on it will start the retrieve; also, show series of partially loaded studies
Merge branch 'develop' of http://github.com/pixmeo/osirix into feature/o2dicompredicateeditor