Summary
- proper PIDE session background for interactive document context;
- NEWS;
- more accurate error messages;
- merged
- actually build document; clarified signature;
- tuned signature;
- tuned comments;
- clarified signature;
- clarified signature;
- tuned;
- clarified GUI;
- more thorough GUI updates, notably for multiple Document dockables;
- Additional new material about infinite products, etc.