* Re-enable support for substitutes in the normaliser.

* A better substitute mechanism.

  Instead of generating a store expression for each store path for
  which we have a substitute, we can have a single store expression
  that builds a generic program that is invoked to build the desired
  store path, which is passed as an argument.

  This means that operations like `nix-pull' only produce O(1) files
  instead of O(N) files in the store when registering N substitutes.
  (It consumes O(N) database storage, of course, but that's not a
  performance problem).

* Added a test for the substitute mechanism.
  
* `nix-store --substitute' reads the substitutes from standard input,
  instead of from the command line.  This prevents us from running
  into the kernel's limit on command line length.

tests/substituter.builder.sh

@@ -0,0 +1,22 @@
+# Set a PATH (!!! impure).
+export PATH=/bin:/usr/bin:$PATH
+
+mkdir $out
+
+cat > $out/substituter <<EOF
+#! /bin/sh -ex
+echo \$*
+
+case \$* in
+    *aaaa*)
+        echo "Closure([\"\$2\"],[(\"\$2\",[])])" > \$1
+        ;;
+    *)
+        mkdir \$1
+        echo \$3 \$4 > \$1/hello
+        ;;
+esac        
+EOF
+
+chmod +x $out/substituter
+