summary text for block messages (trunk only)

[Make use of recent message history changes.]

     Add support to makedefs and the core for including a line of summary
text with quest messages that don't use pline() delivery.  The multi-line
record structure of quest.txt begins each entry with %C and ends with %E.
makedefs now examines the %E lines looking for "[anything]" and adds that
to quest.dat where deliver_by_window() can find it.  The square brackets
are required in the input and intentionally carried along to the output.
putmsghistory() is used to put the summary text into the message history
buffer for use by ^P, without being displayed first.  (So this is a no-op
for interfaces which haven't implemented putmsghistory yet.  Maybe
genl_putmsghistory() should pass such text to pline() as a quick hack?)

     This adds a few summary lines to quest.txt so that the feature can
be tested.  Most of them were written by <Someone> nearly three years
ago.  I'm planning to add a couple of new control codes that'll allow some
of them to expand into shorter text.  (The one where the Archeologist
leader tells you that the nemesis stole the artifact so your mission is
to find the goal level, defeat the nemesis, and return with the artifact
ends up being roughly 160 characters long.)

dat/quest.txt

@@ -59,7 +59,7 @@ All of the windows are boarded up, and there are objects scattered around
 the entrance.
 
 Strange forbidding shapes seem to be moving in the distance.
-%E
+%E [You arrive at %H, but all is not well.]
 %Cp Arc 00002
 Once again, you are back at %H.
 %E
@@ -101,7 +101,7 @@ You have an odd feeling this may be the last time you ever come here.
 "Finally you have returned, %p.  You were always
 my most promising student.  Allow me to see if you are ready for the
 most difficult task of your career."
-%E
+%E [You have returned, %p, to a difficult task.]
 %Cp Arc 00016
 "Again, %p, you stand before me.
 Let me see if you have gained experience in the interim."
@@ -115,20 +115,20 @@ Are you finally ready for the task that must be accomplished?"
 vain.  Begone!  Your tenure at this college has been revoked!
 
 "You are a disgrace to the profession!"
-%E
+%E [%pC, you have failed us.  Begone!]
 %Cc Arc 00019
 "%p, you are yet too inexperienced to undertake such a demanding
 quest.  A mere %r could not possibly face the rigors demanded and
 survive.  Go forth, and come here again when your adventures have further
 taught you."
-%E
+%E [%pC, a mere %r is too inexperienced.]
 %Cc Arc 00020
 "%pC!  I've heard that you've been using sloppy techniques.  Your
 results lately can hardly be called suitable for %ra!
 
 "How could you have strayed from the %a path?  Go from here, and come
 back only when you have purified yourself."
-%E
+%E [%pC, you have strayed from the %a path.  Purify yourself!]
 %Cc Arc 00021
 "Grave times have befallen the college, for %na has
 stolen %o.  Without it, the board of directors of
@@ -144,7 +144,7 @@ to me.
 close this college.
 
 "May the wisdom of %d be your guide."
-%E
+%E [%nC has stolen %o.  Locate %i, defeat %n within, and return %o.]
 %Cp Arc 00025
 "Beware, for %n is powerful and cunning."
 %E
@@ -182,7 +182,7 @@ A plain opens before you.  Beyond the plain lies a foreboding edifice.
 
 You have the feeling that you will soon find the entrance to
 %i.
-%E
+%E [This foreboding edifice must hide the entrance to %i.]
 %Cp Arc 00036
 Once again, you are near the entrance to %i.
 %E
@@ -191,7 +191,7 @@ A strange feeling washes over you, and you think back to things you
 learned during the many lectures of %l.
 
 You realize the feeling must be the presence of %o.
-%E
+%E [This strange feeling must be the presence of %o.]
 %Cp Arc 00041
 The familiar presence of %o is in the ether.
 %E
@@ -200,14 +200,14 @@ The familiar presence of %o is in the ether.
 %o, when your teacher, %l, has already failed.
 
 "Come, try your best!  I shall destroy you, and gnaw on your bones."
-%E
+%E [Come, %p, I shall destroy you!]
 %Cc Arc 00051
 "Again you try to best me, eh %p?  Well, you shall fail again.
 
 "You shall never recover %o.
 
 "I shall bear your soul to the Plane of Origins for my master's pleasure."
-%E
+%E [Again you try to best me, %p?  You shall never recover %o.]
 %Cp Arc 00052
 "You persist yet %p!  Good.  Now, you shall die!"
 %E
@@ -250,7 +250,7 @@ falter!"
 The power of %o flows through your body!  You feel
 as if you could now take on the Wizard of Yendor himself and win, but
 you know you must return %o to %l.
-%E
+%E [The power of %o flows through your body!  You must return it to %l.]
 %Cp Arc 00080
 The body of %n dissipates in a cloud of noxious fumes.
 %E
@@ -266,18 +266,18 @@ Please take %o with you.  You, %p, can
 guard it now far better than I.
 
 May the blessings of %d follow you and guard you."
-%E
+%E [%lC instructs you to guard %o from now on.]
 # assumes Orb of Detection (glass object)
 %Cc Arc 00082
 "Careful, %p!  %oC might break, and that would be
 a tragic loss.  You are its keeper now, and the time has come to
 resume your search for the Amulet.  %Z await your
 return through the magic portal that brought you here."
-%E
+%E [Resume your search for the Amulet beyond the magic portal to %Z.]
 %Cc Arc 00090
 "Welcome back, %p.  Have you progressed with your quest to
 regain the Amulet of Yendor for %d?"
-%E
+%E [Have you progressed with your quest to regain the Amulet of Yendor for %d?]
 %Cc Arc 00091
 "Congratulations, %p.  I wondered if anyone could prevail against
 the Wizard and the minions of Moloch.  Now, you must embark on one
@@ -288,7 +288,7 @@ There you must find the altar of %d and sacrifice the
 Amulet on that altar to fulfill your destiny.
 
 "Remember, your path now should always be upwards."
-%E
+%E [Take the Amulet to the Astral Plane and sacrifice it at the altar of %d.]
 #
 #	Barbarian
 #
@@ -3338,7 +3338,7 @@ from birth as the instrument of %d.  You are destined
 to recover the Amulet for your deity, or die in the
 attempt.  Your hour of destiny has come.  For the sake
 of us all:  Go bravely with %d!
-%E
+%E [%dC has chosen you to recover the Amulet of Yendor.]
 %Cp - 00002
 You receive a faint telepathic message from %l:
 Your help is urgently needed at %H!
@@ -3468,7 +3468,7 @@ you will never be able to enter the place where he who has the Amulet
 resides.
 
 Go now!  You are banished from this place.
-%E
+%E [You are banished from %H for betraying your allegiance to %d.]
 #
 #	TEST PATTERN
 #