Test that exif_read_data exists in PThumb orientation functions. Added a startup test to suggest installing this PHP extension.
Fix #664
Handle multiple selection in InfoPanel : display simple elements previews, plus the standard action bar inc. Download button. Fix #653
Restore folding of the right ("info") panel. And thus restore Download and Share actions in the right-click menu. Added an optional foldingMinSize to splitter to keep a different minSize in unfolded mode. Fix #656
Merge branch 'develop' of https://github.com/pydio/pydio-core into develop