Reorganization

- All garlic stuff is moved into garlic/
- Group the overlay index by sections
- Add a garlic/default.nix link to the main default.nix, so we can
  build derivations at garlic/

garlic/ds/index.nix

@@ -0,0 +1,40 @@
+{
+  super
+, self
+, bsc
+, garlic
+, callPackage
+}:
+
+with garlic.pp;
+
+let
+  exp = garlic.exp;
+in
+{
+  nbody = with exp.nbody; {
+    baseline = merge [ baseline ];
+    small = merge [ small ];
+    jemalloc = merge [ baseline jemalloc ];
+    #freeCpu  = merge [ baseline freeCpu ];
+    ctf = merge [ ctf ];
+  };
+
+  hpcg = with exp.hpcg; {
+    oss = merge [ oss ];
+  };
+
+  saiph = with exp.saiph; {
+    numcomm = merge [ numcomm ];
+    granularity = merge [ granularity ];
+  };
+
+  heat = with exp.heat; {
+    test = merge [ test ];
+  };
+
+  creams = with exp.creams.ss; {
+    ss.hybrid = merge [ hybrid ];
+    ss.pure = merge [ pure ];
+  };
+}