some tabs to spaces

cd src
    grep -P -n '\t' *.c | grep -v "1:"
    cd ../include
    grep -P -n '\t' *.h | grep -v "1:"
    cd ..

side note: win/Qt/*.cpp are full of tabs

src/cmd.c

@@ -4143,7 +4143,7 @@ wiz_mon_diff(void)
                      ptr->pmnames[NEUTRAL], cnt, mlev,
                      mcalculated, mhardcoded, mdiff);
             putstr(win, 0, buf);
-	}
+        }
     }
     if (!trouble)
         putstr(win, 0, "No monster difficulty discrepencies were detected.");