Moved metis into its own library.

Scotch is now built using its own build system which builds
an additional metis.h which conflicts with the metis one so
to have separate include directory settings we also need separate
Make/ structures.

src/meshTools/Make/options

@@ -6,4 +6,5 @@ EXE_INC = \
 LIB_LIBS = \
     -ltriSurface \
     -ldecompositionMethods \
+    -lmetisDecompositionMethod \
     -llagrangian