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/apps/index.nix

@@ -0,0 +1,55 @@
+{
+  super
+, self
+, bsc
+, garlic
+, callPackage
+}:
+
+{
+  nbody = callPackage ./nbody/default.nix {
+    gitBranch = "garlic/seq";
+  };
+
+  saiph = callPackage ./saiph/default.nix {
+    cc = bsc.clangOmpss2;
+  };
+
+  creams = callPackage ./creams/default.nix {
+    gnuDef   = self.gfortran10 ; # Default GNU   compiler version
+    intelDef = bsc.icc    ; # Default Intel compiler version
+    gitBranch = "garlic/mpi+send+seq";
+  };
+
+  creamsInput = callPackage ./creams/input.nix {
+    gitBranch = "garlic/mpi+send+seq";
+  };
+
+  hpcg = callPackage ./hpcg/default.nix {
+    gitBranch = "garlic/oss";
+  };
+
+  bigsort = {
+    sort = callPackage ./bigsort/default.nix {
+      gitBranch = "garlic/mpi+send+omp+task";
+    };
+
+    genseq = callPackage ./bigsort/genseq.nix { };
+
+    shuffle = callPackage ./bigsort/shuffle.nix { };
+  };
+
+  heat = callPackage ./heat/default.nix { };
+
+  miniamr = callPackage ./miniamr/default.nix {
+    variant = "ompss-2";
+  };
+
+  ifsker = callPackage ./ifsker/default.nix { };
+
+  lulesh = callPackage ./lulesh/default.nix { };
+
+  hpccg = callPackage ./hpccg/default.nix { };
+
+  fwi = callPackage ./fwi/default.nix { };
+}