Simple group view of 'All Members' data. See #10243

Simply use -1 as a user_id flag to indicate that we don't want to filter by exp_id
Fixing right-click menu broken by 658e16e
Use canLink() from the server. No client differences
Only enable 'paste' in toolbar if canLink()
Allow Project/Screen creation when Project/Screen selected
Tree nodes '-locked' if not owner
Updating tree icons with red glif for 'owner'
Allow create Dataset when Experimenter selected
{{ index|default:'0' }} in metadata_general.html
Fix drag/drop or paste of object into '-locked' destination. See #10424
Fix drag/drop or paste of object into '-locked' parent (404). See #10424
Fix loading of Orphaned images with 'All Members'
Allow pasting of another's Dataset into own Project
Fix paste of Plate in tree
Fix remove multi-linked Plate from Screen
Fix create Project or Screen when Experimenter selected
Fix removal of 'just-moved' Dataset, Image, Plate. PR761
Don't allow drag & drop if target isn't 'canLink'. See #10486
Merge pull request #761 from will-moore/group_view_10243

Simple group view of 'All Members' data. See #10243