Add TAU package and routines to filter files, fix sed calls.

- TAU doesn't install to directories with '@' in the name.
- Need to fix up its scripts.
- routines to filter files as sed would, but using python regular expressions.
  - TAU package uses this.

var/spack/packages/tau/package.py

@@ -0,0 +1,20 @@
+from spack import *
+
+class Tau(Package):
+    """A portable profiling and tracing toolkit for performance
+       analysis of parallel programs written in Fortran, C, C++, UPC,
+       Java, Python."""
+    homepage = "http://www.cs.uoregon.edu/research/tau"
+    url      = "http://www.cs.uoregon.edu/research/paracomp/tau/tauprofile/dist/tau-2.23.1.tar.gz"
+
+    versions = { '2.23.1' : '6593b47ae1e7a838e632652f0426fe72', }
+
+    def install(self, spec, prefix):
+        # TAU isn't happy with directories that have '@' in the path.  Sigh.
+        change_sed_delimiter('@', ';', 'configure')
+        change_sed_delimiter('@', ';', 'utils/FixMakefile')
+        change_sed_delimiter('@', ';', 'utils/FixMakefile.sed.default')
+
+        # After that, it's relatively standard.
+        configure("-prefix=%s" % prefix)
+        make("install")