[WIP] datagrid - editable list fields

added editable list fields

- [] finish the code
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation


| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | none
| Fixed tickets | none
| Doc           | [url to doc|none]

- Changes in API options.tableHead is now options.columns