Also add usages link on results from Clean core; add two ranking constraints

backend/rank_settings_constraints.json

 [ [{"name":"toInt"},          ["LT",["Class","StdOverloaded","toInt"],            ["Function","StdChar","digitToInt"]]]
 
+, [{"name":"Char"},           ["LT",["TypeDef","_builtin","Char"],                ["Class","StdOverloaded","toChar"]]]
+
 , [{"name":"Foldable"},       ["LT",["Class","Data.Foldable","Foldable"],         ["Class","Text.StringAppender","Appendable"]]]
 , [{"name":"Foldable"},       ["LT",["Class","Data.Foldable","Foldable"],         ["Function","StdList","foldr"]]]
 
@@ -27,6 +29,8 @@
 , [{"unify":"Int -> [Int]"},  ["LT",["Function","Control.Applicative","pure"],    ["Function","Text.Unicode","toUnicode"]]]
 , [{"unify":"Int -> [Int]"},  ["LT",["Function","System._Unsafe","unsafeCoerce"], ["Function","StdMisc","undef"]]]
 
+, [{"using":["Char"]},        ["LT",["TypeDef","_builtin","Char"],                ["Function","StdMisc","abort"]]]
+
 , [{"using":["Text"]},        ["LT",["Class","Text","Text"],                      ["Function","Text.Terminal.VT100","vt100render"]]]
 , [{"using":["Text"]},        ["LT",["Class","Text","Text"],                      ["Function","iTasks.WF.Tasks.Interaction","viewTitle"]]]
 ]

frontend/api.js

@@ -377,12 +377,14 @@ function getResults(str, libs, include_builtins, include_core, include_apps, pag
 
 		var basicText = basic['library'] + ': ' +
 				basic['modul'] + ' (' + dclLink +
-				'<a href="' + iclUrl + '" target="_blank">icl' + iclLine + '</a>) ' +
-				'<a class="usages-link" href="#using ' + basic['name'] + '" title="Find where this is used">usages &rarr;</a>';
+				'<a href="' + iclUrl + '" target="_blank">icl' + iclLine + '</a>)';
 
 		if ('builtin' in basic && basic['builtin'])
 			basicText = 'Clean core. The actual implementation may differ.';
 
+		basicText +=
+			'<a class="usages-link" href="#using ' + basic['name'] + '" title="Find where this is used">usages &rarr;</a>';
+
 		var result = document.createElement('div');
 
 		var basic = document.createElement('div');