cap ftree size

src/js/familyTree.tw

@@ -39,9 +39,13 @@ window.renderFamilyTree = function(slaves, filterID) {
 		ftreeHeight = data.nodes.length * 35;
 		if(ftreeWidth < 600) {
 			ftreeWidth = 600;
+		} else if(ftreeWidth > 1920) {
+			ftreeWidth = 1920;
 		}
 		if(ftreeHeight < 480) {
 			ftreeHeight = 480;
+		} else if(ftreeHeight > 1200) {
+			ftreeHeight = 1200;
 		}
 
 		margin = {top:0, left:0, bottom:0, right:0 }