disable multi-builds (again): does not quite work yet;

clarified modules;

clarified signature;

clarified SEQ: more sequential evaluation to support multiple tests (see also 5c91bd51fc37);

tuned signature;

proper Compress.Cache;

clarified signature;

more parallelism via consumer thread: with mailbox limit to avoid ressource problems;

support for mailbox limit;

tuned signature;

discontinued pointless option (reverting 63d55ba90a9f): performance tuning works better via SQL.Database.execute_batch_statement;

clarified database transactions (see also 2c704ae04db1, 7bd0a250183b);

afford multiple tests on fast machines (see also edb4faf666c9 and 2a26d423d9fb); proper history_base for ARM;

performance tuning: parallel and incremental update of build_log_database;

performance tuning: more careful database access;

clarified message;

tuned signature;

tuned;

prefer old-style import "=>";

merged

redundant (see also 3069da1743bc);

removed obsolete table (see also 6acd1a2bd146);

more robust init_database(); proper treatment of views, not tables (amending dd350a41594c);

proper private_data.transaction_lock; prefer execute_batch_statement;

clarified names;

proper support for SSH;

tuned signature;

tuned imports;

add module for faster scheduled builds;

always use host database and make protected;

read relative cpu from build log;

prefer extensible next_node_info in build process over process_options in build engine (which needs the final node info anyway);