Add ESC as a manner to escape the positional and domain overview overlays

[Laurens van de Wiel]

Implementation:
Add

function keyPress (e) {
    if(e.key === "Escape") {
        $("#domain_information_overlay").removeClass("is-active");
	$("#positional_information_overlay").removeClass("is-active");
        d3.selectAll(".tr").classed("is-selected", false);
    }
}

To https://github.com/cmbi/metadome/blob/master/metadome/presentation/web/templates/js/dashboard.js

[Laurens van de Wiel]

Fixed as of d7eb753