gender and size of leaders and nemeses

Combo fix based on several reports and additional research.
In quest.txt and/or data.base, the Grand Master, Arch Priest, Ixoth, Master
Kaen, Nalzok, Scorpius, and the Master Assassin are all referred to as male
via reference: his or him.  Ideally, there would be a way to parameterize
this in the quest.txt, but I don't see a clear way to do that at this time.
For the time being at least, set the M2_MALE flag for these monsters.

The Dark One was referred to via "his" once in the quest.txt.  This case
I was able to modify the offending text rather than forcing a gender.

Orion and Norn are referred to as a giant in data.base but their size did
not correspond.  I left the symbol as S_HUMAN although perhaps it should
be S_GIANT.  Finally, Orion, the Norn, Cyclops and Lord Surtur, as
giant-types, should be able to tear webs.

dat/quest.txt

@@ -3276,7 +3276,7 @@ and attack the Wizard of Yendor, you know you must return it to its
 rightful owner, %l.
 %E
 %Cc Wiz 00080
-%nC croaks out, as his body begins to shrivel up:
+%nC, whose body begins to shrivel up, croaks out:
 
     I shall haunt your progress until the end of time.  A thousand
     curses on you and %l.