python: always unzip eggs installed into the store

grepping and tagging are two use cases coming to mind

pkgs/development/python-modules/generic/default.nix

@@ -19,7 +19,7 @@
 
 , installCommand ?
     ''
-      easy_install --prefix="$out" .
+      easy_install --always-unzip --prefix="$out" .
     ''
     
 , buildPhase ? "true"
@@ -47,8 +47,6 @@ python.stdenv.mkDerivation (attrs // {
 
   pythonPath = [ setuptools] ++ pythonPath;
 
-  # XXX: Should we run `easy_install --always-unzip'?  It doesn't seem
-  # to have a noticeable impact on small scripts.
   installPhase = ''
     mkdir -p "$out/lib/${python.libPrefix}/site-packages"