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/scorep/package.py

@@ -0,0 +1,74 @@
+# FIXME: Add copyright statement
+
+from spack import *
+
+class Scorep(Package):
+    """The Score-P measurement infrastructure is a highly scalable and
+       easy-to-use tool suite for profiling, event tracing, and online
+       analysis of HPC applications."""
+
+    # FIXME: add a proper url for your package's homepage here.
+    homepage = "http://www.vi-hps.org/projects/score-p"
+    url      = "http://www.vi-hps.org/upload/packages/scorep/scorep-1.2.3.tar.gz"
+
+    version('1.3', '9db6f957b7f51fa01377a9537867a55c',
+            url = 'http://www.vi-hps.org/upload/packages/scorep/scorep-1.3.tar.gz')
+
+    version('1.2.3', '4978084e7cbd05b94517aa8beaea0817')
+
+    depends_on("mpi")
+    depends_on("papi")
+    # depends_on("otf2@1.2:1.2.1") # only Score-P 1.2.x
+    depends_on("otf2")
+    depends_on("opari2")
+    depends_on("cube@4.2:4.2.3")
+
+    backend_user_provided = """\
+CC=cc
+CXX=c++
+F77=f77
+FC=f90
+CFLAGS=-fPIC
+CXXFLAGS=-fPIC
+"""
+    frontend_user_provided = """\
+CC_FOR_BUILD=cc
+CXX_FOR_BUILD=c++
+F77_FOR_BUILD=f70
+FC_FOR_BUILD=f90
+CFLAGS_FOR_BUILD=-fPIC
+CXXFLAGS_FOR_BUILD=-fPIC
+"""
+    mpi_user_provided = """\
+MPICC=mpicc
+MPICXX=mpicxx
+MPIF77=mpif77
+MPIFC=mpif90
+MPI_CFLAGS=-fPIC
+MPI_CXXFLAGS=-fPIC
+"""
+
+    def install(self, spec, prefix):
+        # Use a custom compiler configuration, otherwise the score-p
+        # build system messes with spack's compiler settings.
+        # Create these three files in the build directory
+        with open("platform-backend-user-provided", "w") as backend_file:
+            backend_file.write(self.backend_user_provided)
+        with open("platform-frontend-user-provided", "w") as frontend_file:
+            frontend_file.write(self.frontend_user_provided)
+        with open("platform-mpi-user-provided", "w") as mpi_file:
+            mpi_file.write(self.mpi_user_provided)
+
+        configure_args = ["--prefix=%s" % prefix,
+                          "--with-custom-compilers",
+                          "--with-otf2=%s" % spec['otf2'].prefix.bin,
+                          "--with-opari2=%s" % spec['opari2'].prefix.bin,
+                          "--with-cube=%s" % spec['cube'].prefix.bin,
+                          "--with-papi-header=%s" % spec['papi'].prefix.include,
+                          "--with-papi-lib=%s" % spec['papi'].prefix.lib,
+                          "--enable-shared"]
+
+        configure(*configure_args)
+
+        make()
+        make("install")