DanceNitra

Memory provider with keyed corrections you can undo. A correction retires the old value by key, so it stops being recalled, and inspeximus_revert puts the previous value back from the key alone, without anyone retyping what the record used to say. Recall before each turn returns retrieval minus what a later correction retired, so a value corrected three sessions ago cannot come back as context. Adds inspeximus_remember, inspeximus_correct, inspeximus_revert, inspeximus_forget and inspeximus_forget_me.