Edited Unassigned: After delete the column , only the column is cleared [15284]

on ExcelWorksheet.DeleteRow
```
public void DeleteRow(int rowFrom, int rows)

...

_values.Delete(rowFrom, 0, rows, ExcelPackage.MaxColumns);
```

on CellStore.Delete
```
internal void Delete(int fromRow, int fromCol, int rows, int columns, bool shift)

...

if (columns > 0 && fromRow == 1 && rows >= ExcelPackage.MaxRows)
```

Second parameter of CellStore.Delete is inconsistent with 0 and 1 .

```
if (columns > 0 && fromRow == 0 && rows >= ExcelPackage.MaxRows)
```