Refactored Appbartop
Fixed Bug 620 - refactored Image-management
ListView: Task 581 fixed (async loading added)
Created an own Control for the Thickness Slider: ThicknessControl. Transfered source code to the right classes because of it.
Fixed Bug 621 - better design for variables-pivot in FormulaEditor
Fixed Bug in upload-cleanup
Merge TFS Changeset 1790