Snickersnee can hit at a distance once per turn for free

Once per turn, Snickersnee can be used to hit at a distance,
similar to a polearm, without taking any time.

Breaks saves.

include/context.h

@@ -148,6 +148,7 @@ struct context_info {
     int warnlevel;          /* threshold (digit) to warn about unseen mons */
     long next_attrib_check; /* next attribute check */
     long seer_turn;         /* when random clairvoyance will next kick in */
+    long snickersnee_turn;  /* Snickersnee last used to distance attack */
     long stethoscope_seq;   /* when a stethoscope was last used; first use
                              * during a move takes no time, second uses move */
     boolean travel;  /* find way automatically to u.tx,u.ty */

include/obj.h

@@ -222,10 +222,12 @@ struct obj {
     (otmp->oclass == WEAPON_CLASS                     \
      && objects[otmp->otyp].oc_skill >= P_SHORT_SWORD \
      && objects[otmp->otyp].oc_skill <= P_SABER)
+/* Snickersnee is not a polearm, but can hit from distance */
 #define is_pole(otmp)                                             \
     ((otmp->oclass == WEAPON_CLASS || otmp->oclass == TOOL_CLASS) \
      && (objects[otmp->otyp].oc_skill == P_POLEARMS               \
-         || objects[otmp->otyp].oc_skill == P_LANCE))
+         || objects[otmp->otyp].oc_skill == P_LANCE               \
+         || is_art(otmp, ART_SNICKERSNEE)))
 #define is_spear(otmp) \
     (otmp->oclass == WEAPON_CLASS && objects[otmp->otyp].oc_skill == P_SPEAR)
 #define is_launcher(otmp)                                                  \

include/patchlevel.h

@@ -17,7 +17,7 @@
  * Incrementing EDITLEVEL can be used to force invalidation of old bones
  * and save files.
  */
-#define EDITLEVEL 123
+#define EDITLEVEL 124
 
 /*
  * Development status possibilities.

include/seffects.h

@@ -197,6 +197,7 @@
     seffect(stone_breaking),
     seffect(stone_crumbling),
     seffect(swoosh),
+    seffect(sword_blade_rings),
     seffect(thud),
     seffect(thump),
     seffect(thunderclap),