metis 4.0.3

Add version 4.0.3 to metis package. Attempted to implement reasonable
versions of all variants declared for metis@5.1.0; some of these do
not have analogues in metis@4.0.3, and errors are raised accordingly.

Also updated dependencies of packages with depends_on('metis') to
depends_on('metis@5:') to ensure that these packages still build.

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

@@ -45,7 +45,7 @@ class Eigen(Package):
 
     # TODO : dependency on googlehash, superlu, adolc missing
 
-    depends_on('metis', when='+metis')
+    depends_on('metis@5:', when='+metis')
     depends_on('scotch', when='+scotch')
     depends_on('fftw', when='+fftw')
     depends_on('suite-sparse', when='+suitesparse')