Merge pull request #381 from jlmjlm/tabsd

Select the keyboard push-subdirection with Tab.

control.cpp

@@ -149,6 +149,7 @@ EX void movepckeydir(int d) {
   if(protect_memory()) return;
   
   movedir md = vectodir(move_destination_vec(d));
+  md.subdir = keybd_subdir ? 1 : -1;
     
   if(!canmove) movepcto(md), remission(); else movepcto(md);
   }
@@ -618,6 +619,10 @@ EX void handleKeyNormal(int sym, int uni) {
     else restart_game();
     }
 
+  if(sym == SDLK_TAB) {
+    keybd_subdir = !keybd_subdir;
+    }
+
   if(sym == SDLK_ESCAPE) {
     if(bow::fire_mode)
       bow::switch_fire_mode();