Summary
- more timing;
- tuned;
- init only once (see also c0f776b661fa);
- proper merge (amending fb46c031c841);
- build faster without heap images for minor imports;
- proper order for entries from multiple profiles, notably "AFP";
- tuned output;
- tuned;
- logic_selector refers to raw logic name;
- clarified terminology;
- tuned signature;
- do not store bulky Session.Deps;
- avoid duplicate invocation of expensive Sessions.deps on full_sessions; tuned;
- added isabelle jedit options -B, -P, clarified -R; misc tuning and clarification;
- no heap sharing for empty session (e.g. HOL-ODE);
- tuned diagram;
- clarified ROOT syntax: 'sessions' and 'theories' are optional, but need to be non-empty;