Added popup to duplicate display
Added option to add pHashes to a filter list
Vastly improved sorting performance

It pays to take a closer look at the methods.
Also: more coffee.
Merge branch 'master' into duplicateOps
Added search for filtered items

- Selection by reason not implemented yet
Added scrollpane to display group
Fixed Inputstream leak
Added menu to ignore images

Ignore is non-persistent, reset option not yet reachable via GUI.