- corrected crash in externalCopyManager when the pasted *external content* contains empty lines, thus producing a clippedRange with some entries set to undefined, e.g. clippedRange[0] will be undefined when the pasted data started with an empty line.
- corrected crash in externalCopyManager when the pasted *external content* contains empty lines, thus producing a clippedRange with some entries set to undefined, e.g. clippedRange[0] will be undefined when the pasted data started with an empty line.

- The new code copes with this and (this is a new feature:) replaces any `undefined` value with the value set in the copy manager options: `options.cellValueRepresentingUndefined`

- the events fired by the copy manager now also include the raw external data, if available, via the `rawExternalData` event data member.

GerHobbelt/SlickGrid,GerHobbelt/SlickGrid,GerHobbelt/SlickGrid