Adding lineNumber to SerializationException

[Christopher Brind]

Hi,

Any objections if I add the following to SerializationException in order to
support the Pivot plugin?

    private int lineNumber = 0;

    public SerializationException(String message, int lineNumber) {

    super(message);

    this.lineNumber = lineNumber;

    }


    public int getLineNumber() {

        return lineNumber;

    }


Also plan on modifying WTKXSerializer to pass the line number in where it
can.

With the line number available I'm hoping to be able to put an error marker
on the appropriate line in the source page of the WTKX editor.

Cheers,
Chris