spelling and typo fixes

Submitted for 3.7.0; all but one also apply to 3.6.3.

I rewrote the curses terminal-too-small message instead of just
fixing the spelling of "minumum".

src/bones.c

@@ -598,7 +598,7 @@ getbones()
 
     if (validate(fd, bones) != 0) {
         if (!wizard)
-            pline("Discarding unuseable bones; no need to panic...");
+            pline("Discarding unusable bones; no need to panic...");
         ok = FALSE;
     } else {
         ok = TRUE;

src/hack.c

@@ -2840,7 +2840,7 @@ int x, y;
     if (!IS_DOOR(lev_p->typ))
         return FALSE;
     /* all rogue level doors are doorless but disallow diagonal access, so
-       we treat them as if their non-existant doors were actually present */
+       we treat them as if their non-existent doors were actually present */
     if (Is_rogue_level(&u.uz))
         return FALSE;
     return !(lev_p->doormask & ~(D_NODOOR | D_BROKEN));

src/options.c

@@ -395,7 +395,7 @@ static struct Comp_Opt {
     },
     { "statuslines",
 #ifdef CURSES_GRAPHICS
-      "2 or 3 lines for horizonal (bottom or top) status display",
+      "2 or 3 lines for horizontal (bottom or top) status display",
       20, SET_IN_GAME
 #else
       "2 or 3 lines for status display",

src/potion.c

@@ -2260,7 +2260,7 @@ dodip()
                           more_than_one ? " that you dipped into" : "",
                           newbuf);
             else
-                pline("Somehing happens.");
+                pline("Something happens.");
 
             if (old_dknown
                 && !objects[old_otyp].oc_name_known

src/shk.c

@@ -4396,7 +4396,7 @@ const char *Izchak_speaks[] = {
     "%s says: 'These shopping malls give me a headache.'",
     "%s says: 'Slow down.  Think clearly.'",
     "%s says: 'You need to take things one at a time.'",
-    "%s says: 'I don't like poofy coffee... give me Columbian Supremo.'",
+    "%s says: 'I don't like poofy coffee... give me Colombian Supremo.'",
     "%s says that getting the devteam's agreement on anything is difficult.",
     "%s says that he has noticed those who serve their deity will prosper.",
     "%s says: 'Don't try to steal from me - I have friends in high places!'",

src/timeout.c

@@ -93,7 +93,7 @@ const struct propname {
     { UNCHANGING, "unchanging" },
     { REFLECTING, "reflecting" },
     { FREE_ACTION, "free action" },
-    { FIXED_ABIL, "fixed abilites" },
+    { FIXED_ABIL, "fixed abilities" },
     { LIFESAVED, "life will be saved" },
     {  0, 0 },
 };
@@ -1398,7 +1398,7 @@ long timeout;
         break; /* case [otyp ==] candelabrum|tallow_candle|wax_candle */
 
     default:
-        impossible("burn_object: unexpeced obj %s", xname(obj));
+        impossible("burn_object: unexpected obj %s", xname(obj));
         break;
     }
     if (need_newsym)

src/trap.c

@@ -1591,7 +1591,7 @@ struct obj *otmp;
     switch (tt) {
     case ARROW_TRAP:
         if (!otmp) {
-            impossible("steed hit by non-existant arrow?");
+            impossible("steed hit by non-existent arrow?");
             return 0;
         }
         trapkilled = thitm(8, steed, otmp, 0, FALSE);
@@ -1599,7 +1599,7 @@ struct obj *otmp;
         break;
     case DART_TRAP:
         if (!otmp) {
-            impossible("steed hit by non-existant dart?");
+            impossible("steed hit by non-existent dart?");
             return 0;
         }
         trapkilled = thitm(7, steed, otmp, 0, FALSE);