Improvements of "gf -server" mode and related setup

"gf -server" mode now contains everything needed to run the minibar and
the grammar editor (including example-based grammar writing).

The Setup.hs script installs the required files where gf -server can find them.
These files have been moved to a new directory: src/www.

The separate server program pgf-http is now obsolete.

src/www/gfse/save.hs

@@ -0,0 +1,25 @@
+import System(getArgs)
+import CGI(getQuery,string)
+import MUtils(apSnd)
+
+main = save2 =<< getArgs
+
+{-
+save1 [dir] =
+  do fs@[ns,_] <- readIO =<< getContents
+     nes <- save_all fs
+     putStrLn $ unwords nes
+  where
+    save_all [ns,cs] = mapM (write1 dir) (zip ns cs)
+-}
+
+write1 dir (n,c) = 
+   do writeFile (dir++"/"++ne) c
+      return ne
+  where
+    ne=if '.' `elem` n then n else n++".gf"
+ 
+save2 [dir] =
+  do nfs <- getQuery
+     nes <- mapM (write1 dir . apSnd string) nfs
+     putStrLn $ unwords nes