get/set commandLayer in command and basecommand
layer-functions in CommandManagerImplementation
update commandManagerStub
switchLayercommand + switchlayer in layerdialog
delete layer command + delete layer in layer dialog
findLastCallIndex-Fix
findLastCallIndex-Fix + LayerCommands in ManagerImplementation
merging
combine switch and delete layer branches
drawing at the right position in the command history
switchLayerCommand will not be saved, just done once
save layerdialog data if layer gets deleted for undo
undone,deleted + hidden flag
deleting layer with delete-flag
Show and hide layers
initNewBitmap, reset all data
delete all undos on new commitCommand
sort only on layerchange
finished undo
undo + stub