Fix that col width is not written if other col props are set

[LoadingByte]

Thank you a lot for immediately merging all three pull requests! I really appreciate it :)

I'm terribly sorry that you already published a new release, but there was still a long-standing bug in there which I didn't notice until just now: when properties other than the width are set on a ColumnStyle, the width is no longer written to the ODS. That bug is fixed by this changeset.

[miachm]

Hi LoadingByte!

It seems right it's only being used width. But I am wondering what will happend when we implement other column styles?

[LoadingByte]

In that case, we'd need to introduce a key object in OdsWritter, which only contains the sub-properties of ColumnStyle that are actually written to a <style:style> element.

As an alternative, we could externalize these sub-properties to a ColumnStyleOds class, which is embedded into and delegated to by ColumnStyle, e.g.:

class ColumnStyleOds {
    Double width;
}

class ColumnStyle {
    private ColumnStyleOds columnStyleOds = ColumnStyleOds();
    public Double getWidth() { return columnStyleOds.width; }
    public void setWidth(Double width) { columnStyleOds.width = width; }
}

The class ColumnStyleOds would then function as the key object in OdsWritter.

[miachm]

Giving a second thought, maybe we should wait until that event happens. We can not figure the right solution until we find the problem.