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/petsc/package.py

@@ -40,7 +40,7 @@ class Petsc(Package):
 
     # Other dependencies
     depends_on('boost', when='+boost')
-    depends_on('metis', when='+metis')
+    depends_on('metis@5:', when='+metis')
 
     depends_on('hdf5+mpi', when='+hdf5+mpi')
     depends_on('parmetis', when='+metis+mpi')