config: Generalize infrastructure build materials storage

Infrastructure requires lcms and hcms to build.  The build materials
are exposed as infrastructure columns lcms, hcms (struct sctintrins
members in_lcms, in_hcms).  They are per point of efficiency.  In
contrast, sector and unit build materials are defined for 100%.

We want to define build materials for 100% now, for flexibility and
consistency, and we want to optionally support more build materials in
the future.  Replace members in_lcms and in_hcms by array in_mat[],
and provide selectors l_build and h_build.

Additionally provide selectors for all other item types, with value
zero, to help clients prepare for future additional materials.  Use
CA_DUMP_ONLY to keep them out of configuration tables until they
actually work.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

src/lib/subs/show.c

@@ -429,7 +429,7 @@ show_sect_build(int foo)
 	       "infrastructure type       lcm  hcm mobil     $\n");
 	pr("%-23.23s  %4d %4d %5d %5d\n",
 	   intrchr[i].in_name,
-	   intrchr[i].in_lcms * 100, intrchr[i].in_hcms * 100,
+	   intrchr[i].in_mat[I_LCM], intrchr[i].in_mat[I_HCM],
 	   intrchr[i].in_bmobil, intrchr[i].in_cost);
 	first = 0;
     }