eliminated pointless re-ified errors;

merged

discontinued redundant 'use' command;

discontinued obsolete header "files" -- these are loaded explicitly after exploring dependencies;

discontinued obsolete 'uses' within theory header;

use lemma from Big_Operators

add inclusion/exclusion lemma

added lemma

merged

add wellorder instance for Numeral_Type (suggested by Jesus Aransay)

updated Toplevel.command_exception;

tuned;

tuned signature;

fork diagnostic commands (theory loader and PIDE interaction); explicit id for load_thy, for more robust Goal.fork accounting and commit for each theory -- NB: use_thys nodes become subject to Position.is_reported like PIDE document transactions; clarified Toplevel.command_exception vs. Toplevel.command_errors;

disallow shutdown from worker, which would lead to deadlock since the scheduler cannot terminate;

tuned 2464ba6e6fc9 -- NB: approximative_id is NONE for PIDE document transactions;

signal work_available should be sufficient to initiate daisy-chained workers, and lead to separate broadcast work_finished eventually -- NB: broadcasting all worker threads tends to burn parallel CPU cycles;

less eventful shutdown: merely wait for scheduler to terminate;

tuned messages;

tuned;

merged;

more explicit Goal.shutdown_futures;

reconsider 'export_code' as "thy_decl" command due to its global side-effect on the file-system;

discontinued pointless command category "thy_schematic_goal" -- this is checked dynamically;

clarified Toplevel.element_result: scheduling policies happen here; tuned;

prefer stateless 'ML_val' for tests;

tuned comment;

reconsider 'pretty_setmargin' as "control" command (instead of "diag") -- it is stateful and Proof General legacy;

merged;

simplified Outer_Syntax.read_span: internalized Toplevel.is_ignored; eliminated separate Outer_Syntax.read_element;