Laze.force_result: more robust treatment of interrupts stemming from peer group cancellation;

more precise treatment of deleted nodes;

tuned error message;

unified type Document.Edit;

replaced Document.Node_Text_Edit by Document.Text_Edit, with treatment of deleted nodes; Document_Model.pending_edits: more robust treatment of init, including buffer reload event (jEdit 4.3.2 produces malformed remove/insert that lacks the last character); tuned;

tuned;