Fixed NPE
mode = "navigation"
added findOpenEditorWindows()
Window tiling enhancements:
- Now allow for tiling docked editor windows *and* workspace windows
- Added corresponding toolbar actions
Context menu of Band and Tie-Point Grid are now extendable via layer xml.

Dummy BandMathsAction
Removed remaining TODOs regarding off-WindowManager workspace window notifications
Fixed NPE
Fixed ID
added -Dsun.java2d.dpiaware=false to the list of vm options

even though it is not really needed, because scaling worked anyway. But for documentation purpose it is good to have it here
Added TileSingleAction
Added enablement for tile actions
Simplified action definition
Api doc
No longer showing on startup
Navigation Window now correctly docks into navigator mode
Refactorings, move and rename
Now also uses getBestSubdivisionIntoSquares()
Set log level to fine
Fixed internal frame activation issue
Added help context IDs and TODOs to create help pages for them