Added as_doc and comments to KSKLibrary model.data_structures (except KSceneGraph.as)
Added as_doc and comments to KSKLibrary operators.operations.
Added as_doc and comments to KSKLibrary operators package
Added as_doc and comments to KSKLibrary utils and events packages
Added as_doc and comments to KSKLibrary model.objects package
Added as_doc and comments to KSketch2.as and model.data_structures.KSceneGraph.as