merged

new theory of polynomials

tuned categories;

added outer_keyword.scala: Isar command keyword classification;

added Goal.future_enabled abstraction -- now also checks that this is already a future task, which excludes interactive commands of the old toplevel;

load main entry points sequentially, for reduced memory demands;

merged

merged

less ambitious ML_OPTIONS;

merged

merged

explicit bookkeeping of intro rules and axiom

stripped Id

construct explicit class morphism

less ambitious ML_OPTIONS;

schedule_futures: save memory for non-parallel proofs, by applying after_load as soon as possible here;

future_result: avoid expensive norm_proof (consider usedir option -Q false in low-memory situations);

added parallel_proofs flag (default true, cf. usedir option -Q), which can be disabled in low-memory situations;

remove_thy: perform PureThy.cancel_proofs; schedule_futures: PureThy.join_proofs before after_load -- achieves parallel error messages;

added cancel_proofs, based on task groups of "entered" proofs;

added pending_groups -- accumulates task groups of local derivations only;

added cancel_group;

merged

schedule_futures: tuned final consolidation, explicit after_load phase;

load_thy: explicit after_load phase for presentation;

excursion: commit_exit internally -- checkpoints are fully persistent now; excursion: do not force intermediate result states yet -- great performance improvement;

slightly more robust matching of session name;

merged

fixed proof involving dvd;

tuned;