Remove ranking constraints for exact results; use efficient StdMaybe from Cloogle

Cloogle @ 8e4856c5

-Subproject commit 7f9aa332c7a5454d1a6850835eda47cd3f12c1b1
+Subproject commit 8e4856c55edbe366a02558fb4ade9d5a4bb8a7de

backend/Makefile

@@ -3,6 +3,8 @@ BIN:=builddb CloogleServer
 DB=types.json
 CLM:=clm
 CLMFLAGS:=-h 250M -nr -nortsopts\
+	-P 'Cloogle'\
+	-IL StdEnv\
 	-IL TCPIP\
 	-IL Platform\
 	-IL Platform/Deprecated/ArgEnv\

backend/rank_settings_constraints.json

@@ -28,9 +28,4 @@
 , [{"unify":"Int -> [Int]"},  ["LT",["Function","Control.GenMonad","ret"],        ["Function","StdMisc","undef"]]]
 , [{"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"]]]
 ]