Activate 'droppable' property for feed icons.
Detect which feeds can be merged when dragging/dropping and only enable these as valid targets.
Hook up the API to merge two feeds.
Re-activate droppable feeds whenever new content arrives.
Merging of feeds works.
Auto-refresh the file browser after merging two feeds.
Always use the job_id as a subfolder even in non-batch mode.
Since all output folders now contain at least the 0/ subfolder, directly navigate into it when only 0/ exists.
Add logic to treat "/0/" output folders (which are directly linked for convenience)  whenever feeds get merged.
Merge branch 'feedGrouping'