more symbols; tuned proofs;

tuned message: "step" goes back to TTY mode before Proof General, while "depth" is more informative but sometimes confusing due to implementation details;

print results as "state", to avoid intrusion into the source text; print new local theory (again);

run commands as interactive, again after long history of fluctuation (9e196062bf88, 173974e07dea, e07dacec79e7) and quite different infrastructure for print tasks;