Summary
- more formal contributors (with the help of the history);
- proper data columns for plots;
- merged
- tuned -- Toplevel.presentation_context is total;
- document markers are formal comments, and may thus occur anywhere in the command-span; clarified Outer_Syntax.parse_span, Outer_Syntax.parse_text wrt. span structure; tuned signature;
- PIDE markup for spell-checking;
- markup and document markers for some meta data from "Dublin Core Metadata Element Set";
- tuned;
- added semantic document markers; emulate old-style tags as "tag" markers, with subtle change of semantics for multiples tags (ever used?); tuned;
- clarified signature;
- added glyph for \<marker>;
- tuned proof;
- clarified Toplevel.state: more explicit types; presentation context is always present, with default to Pure.thy and fall-back to Pure bootstrap theory;
- tuned;
- merged
- tidied up HOL/ex/Primrec