Modify the window interface for print_glyph

Changes to be committed:
	modified:   doc/window.doc
	modified:   include/qt_win.h
	modified:   include/trampoli.h
	modified:   include/winX.h
	modified:   include/wingem.h
	modified:   include/winprocs.h
	modified:   include/wintty.h
	modified:   src/display.c
	modified:   src/windows.c
	modified:   sys/amiga/winami.p
	modified:   sys/amiga/winfuncs.c
	modified:   sys/amiga/winproto.h
	modified:   sys/wince/mswproc.c
	modified:   sys/wince/winMS.h
	modified:   win/Qt/qt_win.cpp
	modified:   win/X11/winmap.c
	modified:   win/chain/wc_chainin.c
	modified:   win/chain/wc_chainout.c
	modified:   win/chain/wc_trace.c
	modified:   win/gem/wingem.c
	modified:   win/gem/wingem1.c
	modified:   win/gnome/gnbind.c
	modified:   win/tty/wintty.c
	modified:   win/win32/mswproc.c
	modified:   win/win32/winMS.h

print_glyph now takes a second parameter.

Tiles on tiled ports always looked odd on places like the plane of air
where the background color of the tile didn't match the general background
of the surrounding area.

3.6 made that even worse and more glaringly noticeable with the introduction
of darkened room tiles.

The code to actually send something useful through the new parameter
for window ports to take advantage if they want will follow.

doc/window.doc

@@ -1,4 +1,4 @@
-NetHack 3.6  window.doc	$NHDT-Date: 1432512786 2015/05/25 00:13:06 $  $NHDT-Branch: master $:$NHDT-Revision: 1.39 $
+NetHack 3.6  window.doc	$NHDT-Date: 1433806574 2015/06/08 23:36:14 $  $NHDT-Branch: master $:$NHDT-Revision: 1.40 $
 
 Introduction
 
@@ -192,11 +192,16 @@ int nh_poskey(int *x, int *y, int *mod)
 
 B.  High-level routines:
 
-print_glyph(window, x, y, glyph)
+print_glyph(window, x, y, glyph, bkglyph)
 		-- Print the glyph at (x,y) on the given window.  Glyphs are
 		   integers at the interface, mapped to whatever the window-
 		   port wants (symbol, font, color, attributes, ...there's
 		   a 1-1 map between glyphs and distinct things on the map).
+		-- bkglyph is a background glyph for potential use by some
+		   graphical or tiled environments to allow the depiction
+		   to fall against a background consistent with the grid 
+		   around x,y.
+                   
 char yn_function(const char *ques, const char *choices, char default)
 		-- Print a prompt made up of ques, choices and default.
 		   Read a single character response that is contained in