Add way to cycle through valid locations for polearm or jump target

include/flag.h

@@ -491,6 +491,8 @@ enum nh_keyfunc {
     NHKF_GETPOS_UNEX_PREV,
     NHKF_GETPOS_INTERESTING_NEXT,
     NHKF_GETPOS_INTERESTING_PREV,
+    NHKF_GETPOS_VALID_NEXT,
+    NHKF_GETPOS_VALID_PREV,
     NHKF_GETPOS_HELP,
     NHKF_GETPOS_MENU,
     NHKF_GETPOS_LIMITVIEW,
@@ -504,6 +506,7 @@ enum gloctypes {
     GLOC_DOOR,
     GLOC_EXPLORE,
     GLOC_INTERESTING,
+    GLOC_VALID,
 
     NUM_GLOCS
 };