* refactor TaskPostDataAtPoint::on_Field_activated()
* show results in a label instead of message box to reduce clicks
* in output window also print field and position as the pure values are useless
- we cannot assume to have a geometry at position (0, 0, 1) this initialize at (0, 0, 0)
- also don't hardcode the unit in the UI file
- also fix wrong property description
- property "Radius" is not used in the code and it seems it is only there as copy paste bug once the point filter was implemented. However close to a release, keep the property and just mention it is unused.
- the App part used already units but the dialog worked unitless. This is error-prone and confusing. Therefore use unit widgets in the dialog.
- also fix issue that unit was not reset (after e.g. a temperature maybe a unitless strain should be shown)
