Preparations for release of GF 3.3

+ Changing version numbers and dates here and there.
+ Simplify build-binary-dist.sh since pgf-http need not be built anymore.
+ Use--gf-lib-path to make the sample grammars for minibar compile even if GF
  is not installed.

download/index-3.3.t2t

@@ -11,7 +11,7 @@ Grammatical Framework Download and Installation
 What's new? See the [Release notes release-3.3.html].
 
 
-== Latest released binary packages ==
+== Binary packages ==
 
 **TO BE UPDATED**