Merge pull request #404 from fedorov/add-windowleveleffect

Changes to the WindowLevelEffect extension hierarchy trying to fix the i...
Merge pull request #405 from fedorov/add-windowleveleffect

Add missed cmake file for WindowLevelEffect extension
Fix Linux compilation error
Merge pull request #406 from millerjv/update-PkModeling

Fix Linux compilation error on PkModeling
Update WindowLevelEffect extension

Update the cmake macro to fix packaging issues

https://github.com/fedorov/WindowLevelEffect/compare/1303...6a84