Skipped document validation for deleted docs.

This shouldn't have any effect right now, but I might need it later.
Allowed _list/tabulate to read _special fields.

They are unlikely to be mixed up with any js syntax, so there's no reason to
impose restrictions.
Added doc.GeoJSON to _view/geojson's values.

There was no way to rule out cloned geometries in the filter form before.
Set height of table header to accomodate two lines of text.