Set fill mode

## Set fill mode User can use **FM(FillMode)** property to change the data filling mode of template. It supports two values: **Insert**(default) Insert empty lines when template expands, then set data and style of template cell in the empty lines. **Overwrite** Directly overwrite the cells defined in the template with data, without applying any style. (The default style set in the template will be used while template expands). This is very useful if user has a fixed layout template. When using overwrite mode, user can use property **FR(FillRange)** to specify a range for overwriting data. If the data is overflow for the range, Document Solutions for Excel will duplicate the fill range accordingly to set data.