(mchrstr, plchrstr, lchrstr, nchrstr): New member m_type, pl_type,

l_type, n_type.
(mchr_ca, plchr_ca, lchr_ca, nchr_ca): New selector type.  Update
builtin config files.

include/nuke.h

@@ -64,6 +64,7 @@ struct nchrstr {
     int n_tech;			/* tech needed to build */
     int n_weight;
     int n_flags;		/* description of capability */
+    signed char n_type;		/* index in nchr[] */
 };
 
 #define	N_NEUT	bit(0)		/* Neutron bomb (low damage, high fallout) */