New, cleaner package repository structure.

Package repositories now look like this:

    top-level-dir/
        repo.yaml
        packages/
            libelf/
                package.py
            mpich/
                package.py
            ...

This leaves room at the top level for additional metadata, source,
per-repo configs, indexes, etc., and it makes it easy to see that
something is a spack repo (just look for repo.yaml and packages).

var/spack/repos/builtin/packages/thrift/package.py

@@ -0,0 +1,44 @@
+from spack import *
+
+class Thrift(Package):
+    """The Apache Thrift software framework, for scalable cross-language services
+    development, combines a software stack with a code generation engine to build
+    services that work efficiently and seamlessly between C++, Java, Python, PHP,
+    Ruby, Erlang, Perl, Haskell, C#, Cocoa, JavaScript, Node.js, Smalltalk, OCaml
+     and Delphi and other languages."""
+
+    homepage = "http://thrift.apache.org"
+    url      = "http://apache.mirrors.ionfish.org/thrift/0.9.2/thrift-0.9.2.tar.gz"
+
+    version('0.9.2', '89f63cc4d0100912f4a1f8a9dee63678')
+
+    extends("python")
+
+    depends_on("autoconf")
+    depends_on("automake")
+    depends_on("bison")
+    depends_on("boost")
+    depends_on("flex")
+    depends_on("jdk")
+    depends_on("libtool")
+    depends_on("openssl")
+    depends_on("python")
+
+    # Compilation fails for most languages, fortunately cpp installs fine
+    # All other languages (yes, including C) are omitted until someone needs them
+    def install(self, spec, prefix):
+        env["PY_PREFIX"]   = prefix
+        env["JAVA_PREFIX"] = prefix
+
+        configure("--prefix=%s" % prefix,
+                  "--with-boost=%s" % spec['boost'].prefix,
+                  "--with-c=no",
+                  "--with-go=no",
+                  "--with-python=yes",
+                  "--with-lua=no",
+                  "--with-php=no",
+                  "--with-qt4=no",
+                  "--enable-tests=no")
+
+        make()
+        make("install")