Revert "Completely remove uses of example-based"

This reverts commit 69cea20dac.

src/compiler/GF/Server.hs

@@ -43,6 +43,7 @@ import GF.Infra.UseIO(readBinaryFile,writeBinaryFile,ePutStrLn)
 import GF.Infra.SIO(captureSIO)
 import GF.Data.Utilities(apSnd,mapSnd)
 import qualified PGFService as PS
+import qualified ExampleService as ES
 import Data.Version(showVersion)
 import Paths_gf(getDataDir,version)
 import GF.Infra.BuildInfo (buildInfo)
@@ -170,6 +171,7 @@ handle logLn documentroot state0 cache execute1 stateVar
                (_  ,_             ,".pgf") -> do --debug $ "PGF service: "++path
                                                  wrapCGI $ PS.cgiMain' cache path
                (dir,"grammars.cgi",_     ) -> grammarList dir (decoded qs)
+               (dir  ,"exb.fcgi"  ,_    ) -> wrapCGI $ ES.cgiMain' root dir (PS.pgfCache cache)
                _ -> serveStaticFile rpath path
              where path = translatePath rpath
            _ -> return $ resp400 upath
@@ -207,7 +209,7 @@ handle logLn documentroot state0 cache execute1 stateVar
            ((_,(value,_)):qs1,qs2) -> do put_qs (qs1++qs2)
                                          return value
            _ -> err $ resp400 $ "no "++field++" in request"
-
+    
     inDir ok = cd =<< look "dir"
       where
         cd ('/':dir@('t':'m':'p':_)) =