Move /etc/conf.d/rc to /etc/rc.conf.

Lowercase all configurable variables, non configurations remain uppercase.
Replace rc_env_bool with rc_yesno.
Split localmount info procfs (Linux) and dumpon, savecore (BSD)

src/rc-update.c

@@ -185,7 +185,7 @@ int rc_update (int argc, char **argv)
 		}
 	}
 
-	verbose = rc_env_bool ("RC_VERBOSE");
+	verbose = rc_yesno (getenv ("RC_VERBOSE"));
 
 	if ((action & DOSHOW   && action != DOSHOW) ||
 		(action & DOADD    && action != DOADD) ||