Converted TableLayoutWdg to use <div> elements

[remkonoteboom]

1. groups in hidden rows not collapsable (but its fine, cause every new fix brakes something else)
Looking at the code, I don't think this worked before. I did fix it though.

2. task element widget, and gantt element widgets are always narrow
This is because if there is no specified default width, it will be set to about 100px. If you want a specific width for your column, start width for you column, then you can set it in the element definition.