Renaming and definition of NULL_LOCATION in Painter class.
Deleted draw function in UI.
Renaming in Painter class.
More renaming in Painter class.
Bugfix: Perform an initial update of the flags for nodes, edges and faces. This fix an issue where the boundary flags were not initialized.
Added boundary shaders.
Major clean-up in the Painter class.
Added painting of the boundary to the Painter class.