temporary disable group feature
Revert "temporary disable group feature"

This reverts commit d5ecb87ce2c5a32714021849859503b02ca57a81.
Merge branch 'master' into dev
display the group menu item again (still not working...)
fix multiple group instances loading values/connections
fix error when destroying group
fix issue if field is not part of a subnode
hide input field in subnode if it has internal connections
remove one console.log
add group instead of subnodes to the selected_nodes list
render group subnodes in sidebar
fix issue when selecting multiple groups
display the group title in the sidebar
little refactoring in groupdefinition.getNodesAveragePosition
refactoring selected_nodes in GroupDefinitions.groupSelectedNodes
fix group test
remove a couple of console.log
remove views from workspace when they are deleted
reverting last commit...
recreate workspace when defining active nodes