PGF.hs: export function missingLins

Also in Commands.hs: be explicit about things imported from the PGF library
that are not in the public API.
Also a couple of haddock documentation fixes.

src/compiler/GF/Command/Commands.hs

@@ -13,17 +13,17 @@ module GF.Command.Commands (
 import Prelude hiding (putStrLn)
 
 import PGF
-import PGF.CId
-import PGF.Linearize
-import PGF.VisualizeTree
-import PGF.Macros
-import PGF.Data ----
-import PGF.Morphology
-import PGF.Printer
-import PGF.Probabilistic -- (getProbsFromFile,prProbabilities,defaultProbabilities)
+
+import PGF.VisualizeTree(graphvizParseTreeOld,getDepLabels)
+import PGF.Macros(lookStartCat,functionsToCat,lookValCat,restrictPGF,hasLin)
+import PGF.Data(abstract,funs,cats,Literal(LStr),Expr(EFun,ELit)) ----
+import PGF.Morphology(isInMorpho,morphoKnown)
+import PGF.Printer(ppFun,ppCat)
+import PGF.Probabilistic(rankTreesByProbs,probTree,setProbabilities)
 import PGF.Generate (generateRandomFrom) ----
 import PGF.Tree (Tree(Fun), expr2tree, tree2expr)
-import PGF.Optimize
+import PGF.Optimize(optimizePGF)
+
 import GF.Compile.Export
 import GF.Compile.ToAPI
 import GF.Compile.ExampleBased

src/runtime/haskell/PGF.hs

@@ -35,7 +35,7 @@ module PGF(
            categories, startCat,
 
            -- * Functions
-           functions, functionsByCat, functionType,
+           functions, functionsByCat, functionType, missingLins,
 
            -- * Expressions & Trees
            -- ** Tree
@@ -132,7 +132,7 @@ module PGF(
            showProbabilities,
            readProbabilitiesFromFile,
            
-           -- ** SortTop
+           -- -- ** SortTop
 --         forExample,
 
            -- * Browsing

src/runtime/haskell/PGF/Macros.hs

@@ -69,12 +69,13 @@ functionsToCat pgf cat =
  where 
    (_,fs,_) = lookMap ([],[],0) cat $ cats $ abstract pgf
 
-missingLins :: PGF -> CId -> [CId]
+-- | List of functions that lack linearizations in the given language.
+missingLins :: PGF -> Language -> [CId]
 missingLins pgf lang = [c | c <- fs, not (hasl c)] where
   fs = Map.keys $ funs $ abstract pgf
   hasl = hasLin pgf lang
 
-hasLin :: PGF -> CId -> CId -> Bool
+hasLin :: PGF -> Language -> CId -> Bool
 hasLin pgf lang f = Map.member f $ lproductions $ lookConcr pgf lang
 
 restrictPGF :: (CId -> Bool) -> PGF -> PGF