separate static build_uuid from dynamic worker_uuid, to allow multiple worker processes participate in one build process;

enforce rebuild of Isabelle/ML, after various changes to build database management;

more detailed table "isabelle_build_serial": allow to monitor activity of build_process instances;

tuned output;

clarified database content: store actual value instead of index;

more robust: disallow override;

tuned messages;

more complete coverage of non-final Progress methods, notably for Server.Connection_Progress;

clarified signature: manage "verbose" flag via "progress";

removed unused arguments: avoid ambiguity concerning progress/verbose;

clarified protocol for "verbose" messages;

clarified signature: manage "verbose" flag via "progress";

tuned;

tuned;

more operations;

tuned signature;

more robust: proper bound checks;

enforce rebuild of Isabelle/ML, after various changes to build database management;

clarified modules;

clarified signature: manage "verbose" flag via "progress";

clarified treatment of "verbose" messages, e.g. Progress.theory(); always store messages within database, with explicit "verbose" flag: client-side will decide about output;

proper "val verbose" (amending 2e2b2bd6b2d2);

tuned whitespace;

more robust signature: avoid totally adhoc overriding (see also Build_Process.progress vs. build_progress);

support progress backed by database; moved Build_Progress.Context.progress/log to class Build_Process: database is available here;

tuned;

tuned messages;

clarified signature: require just one "override def echo(message: Progress.Message): Unit";

tuned signature;

tuned signature;