cleanup the code for the FFI binding. The API is now more uniform with the Python and the Java bindings. Fixed a lot of memory leaks.

src/runtime/haskell-bind/pgf2-bind.cabal

@@ -0,0 +1,36 @@
+-- Initial haskell-bind.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                pgf2-bind
+version:             0.1.0.0
+-- synopsis:            
+-- description:         
+homepage:            http://www.grammaticalframework.org
+license:             LGPL-3
+--license-file:        LICENSE
+author:              Inari
+maintainer:          Krasimir Angelov
+-- copyright:           
+category:            Language
+build-type:          Simple
+extra-source-files:  README
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     PGF2
+  other-modules:       PGF2.FFI
+  build-depends:       base >=4.5 && <4.7, bytestring >=0.9 && <0.11,
+                       containers
+  -- hs-source-dirs:      
+  build-tools:         hsc2hs
+  extra-libraries:     gu pgf
+  cc-options:          -std=c99
+  default-language:    Haskell2010
+
+executable pgf-shell
+  main-is:             pgf-shell.hs
+  hs-source-dirs:      examples
+  build-depends:       base, haskell-bind, containers
+  default-language:    Haskell2010
+  if impl(ghc>=7.0)
+    ghc-options: -rtsopts