Add a wide-toggle to Float Options dialog.

[R. Lahaye]

Hi,

Would it make sense to add a wide-float entry to the
Float-Options dialog? Possibly the wide-float entries
from the Insert-Floats menulist can go.

This would allow us to change the wide-attribute of existing
floats, instead of the necessity to create a new one from
scratch when wanting to toggle this.

Regards,
Rob.