documentation updates

- various commands were missing from various help files
- fix a few inconsistencies between similar help files
- M-2 doesn't do #twoweapon when number_pad is enabled
- M-? usually displays #? help info
- weasel-word the reason the screen shown in the Guidebook looks little like
  several windowports
- document the playersuffix syntax in the nethack.6 man page

dat/cmdhelp

@@ -30,7 +30,7 @@ f       Fire ammunition from quiver
 F       Followed by direction, fight a monster (even if you don't sense it)
 g       Followed by direction, move until you are near something
 G       Followed by direction, same as control-direction
-h       Go west 1 space
+h       Go west 1 space (if number_pad is on, display help message)
 H       Go west until you are on top of something
 ^H      Go west until you are near something
 i       Show your inventory
@@ -98,7 +98,8 @@ _       Travel via a shortest-path algorithm to a point on the map
 $       Count your gold
 +       List known spells
 #       Perform an extended command
-M-2     Toggle two-weapon combat
+M-?     Display extended command help (if the platform allows this)
+M-2     Toggle two-weapon combat (unless number_pad is enabled)
 M-a     Adjust inventory letters
 M-c     Talk to someone
 M-d     Dip an object into something

dat/help

@@ -43,7 +43,7 @@ on.
         \        An opulent throne.
         `        A boulder or statue.
         A to Z, a to z, and several others:  Monsters.
-        I        Invisible monster's last known location
+        I        Invisible or unseen monster's last known location
 
                  You can find out what a symbol represents by typing
                  '/' and following the directions to move the cursor
@@ -60,7 +60,10 @@ b j n   1 2 3           g<dir>:   run in direction <dir> until something
                         G<dir>,   same, except a branching corridor isn't
  <  up                  ^<dir>:     considered interesting
  >  down                m<dir>:   move without picking up objects
+                        F<dir>:   fight even if you don't sense a monster
                 If the number_pad option is set, the number keys move instead.
+                Depending on the platform, Shift number (on the numberpad),
+                Meta number, or Alt number will invoke the YUHJKLBN commands.
 
 Commands:
         NetHack knows the following commands:
@@ -162,15 +165,17 @@ Commands:
                 has a meta key (which, when pressed in combination with another
                 key, modifies it by setting the 'meta' (8th, or 'high') bit),
                 these extended commands can be invoked by meta-ing the first
-                letter of the command.
+                letter of the command.  An alt key may have a similar effect.
 
         If the "number_pad" option is on, some additional letter commands
         are available:
 
+        h       displays the help menu, like '?'
         j       Jump to another location.
         k       Kick (for doors, usually).
         l       Loot a box on the floor.
-        n       Name an object or type of object.
+        n       followed by number of times to repeat the next command
+        N       Name an object or type of object.
         u       Untrap a trapped object or door.
 
         You can put a number before a command to repeat it that many times,
@@ -178,7 +183,8 @@ Commands:
         must type 'n' to prefix the count, as in "n40." or "n20s".
 
 
-        Some information is displayed on the bottom line.  You see your
+        Some information is displayed on the bottom line or perhaps in a
+        box, depending on the platform you are using.  You see your
         attributes, your alignment, what dungeon level you are on, how many
         hit points you have now (and will have when fully recovered), what
         your armor class is (the lower the better), your experience level,

dat/hh

@@ -9,6 +9,8 @@ b j n   1 2 3           g<dir>:   run in direction <dir> until something
  >  down                m<dir>:   move without picking up objects/fighting
                         F<dir>:   fight even if you don't sense a monster
                 If the number_pad option is set, the number keys move instead.
+                Depending on the platform, Shift number (on the numberpad),
+                Meta number, or Alt number will invoke the YUHJKLBN commands.
 
 General commands:
 ?       help    display one of several informative texts
@@ -78,7 +80,8 @@ _       travel  move via a shortest-path algorithm to a point on the map
 Keyboards that have a meta key can also use these extended commands
 via the meta modifier instead of the # prefix:
 
-M-2     twoweapon toggle two-weapon combat
+M-?             Display extended command help (if the platform allows this)
+M-2     twoweapon toggle two-weapon combat (unless number_pad is enabled)
 M-a     adjust  adjust inventory letters
 M-c     chat    talk to someone
 M-d     dip     dip an object into something
@@ -102,6 +105,7 @@ M-w     wipe    wipe off your face
 If the "number_pad" option is on, these additional variants are available:
 
 n               followed by number of times to repeat the next command
+h       help    display one of several informative texts, like '?'
 j       jump    jump to another location
 k       kick    kick something (usually a door)
 l       loot    loot a box on the floor