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adds a rows/cols span

addSpan(spanObj: ISpan): void;


spanObj: object - an object with configuration of a span


row: "0",
column: "a",
rowspan: 5
// grid.paint();

The span object contains the following properties:

row(string|number) mandatory, the id of a row
column(string|number) mandatory, the id of a column
rowspan(number) optional, the number of rows in a span
colspan(number) optional, the number of columns in a span
text(string|number) optional, the text in a spanned row/column
css(string|number) optional, the name of the CSS class that will be applied to a span