- fetchdarcs supports now partial

- fetchdarcs_2pre added
- flapjax added
- no longer used : annotatedDerivations
- added bleeding edge repos with a tiny nix repository manager which dowloads and
  updates repostiries, then creates tar.gz dist files which are used by bleeding_edge_source
  (darcs tested only by now)
- added experimental my_environment with example

svn path=/nixpkgs/trunk/; revision=10974

pkgs/build-support/fetchdarcs/default.nix

@@ -1,9 +1,10 @@
-{stdenv, darcs, nix}: {url, tag ? null, md5}:
+{stdenv, darcs, nix}: {url, tag ? null, md5, partial ? true}:
 
 stdenv.mkDerivation {
   name = "fetchdarcs";
   builder = ./builder.sh;
   buildInputs = [darcs nix];
+  partial = if partial then "--partial" else "";
 
   # Nix <= 0.7 compatibility.
   id = md5;