added is_none; added inner_comment;

Args.name_source(_position) for proper position information;

[source=false] for quoted antiquotation avoids quote-escapes in output;

report antiquotations;

tuned;

report ML_source;

renamed P.ml_source to P.ML_source;

report doc_source;

added ML_source, doc_source;

antiquotes: proper SymbolPos decoding, adapted Antiquote.read/Antiq;

added source_of';

P.doc_source and P.ml_sorce for proper SymbolPos.text;

oracle, header/local_theory/proof_markup: pass SymbolPos.text;

use SymbolPos.T list directly, instead of encoded SymbolPos.text;

ML_Context.add_antiq: pass position; @{lemma}: set source position;

ML_Context.add_antiq: pass position;

retrieve_thms: transfer fact position to result; tuned;

moved basic thm operations from structure PureThy to Thm; added position operations; tuned;

moved basic thm operations from structure PureThy to Thm (cf. more_thm.ML);

made SML/NJ happy;

removed obsolete present_html -- now part of regular theory presentation;

removed obsolete verbatim_source, results, chapter, section etc.; removed obsolete results, theorems(s); moved theorem result hook to proof_display.ML;

removed obsolete verbatim_source, results, chapter, section etc.; removed redundant end_index, end_theory;

ProofDisplay.add_hook;

simplified present_local_theory/proof;

ProofDisplay.theory_results;

removed obsolete present_results; added theory_results, which is subject to hooks (formerly in present.ML);

scan: SymbolPos.tabify_content when creating tokens (for proper presentation output);