Another batch of manual header var additions

sys/vms/install.com

@@ -1,5 +1,8 @@
 $ ! vms/install.com -- set up nethack 'playground'
 $ !
+$ ! $NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$
+$ ! $Date: 2006/09/23 04:45:56 $  $Revision: 1.4 $
+$ !
 $ ! Use vmsbuild.com to create nethack.exe, makedefs, and lev_comp *first*.
 $ !
 $ ! Edit this file to define gamedir & gameuic, or else invoke it with two

sys/vms/nethack.com

@@ -1,6 +1,9 @@
 $! NetHack.Com -- sample command procedure for invoking NetHack  9-JAN-1993
 $ v = 'f$verify(0)'
 $!
+$! $NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$
+$! $Date: 2002/01/05 21:06:00 $  $Revision: 1.1 $
+$!
 $!    Possible command line arguments include
 $!	"-uConan-B"	!play a barbarian named Conan
 $!	"-u" "Merlin-W" !play a wizard named Merlin (slight variant of above)

sys/vms/spec_lev.com

@@ -1,5 +1,8 @@
 $ ! sys/vms/spec_lev.com -- preprocess nethack's special level compiler code
 $ !
+$ ! $NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$
+$ ! $Date: 2002/01/05 21:06:00 $  $Revision: 1.1 $
+$ !
 $ ! This operation needs to be performed prior to executing vmsbuild.com.
 $ ! Process the scanning and parsing code for NetHack's special level
 $ ! and dungeon compilers.  *.l and *.y are converted into *'.c and *.h.

sys/vms/vmsbuild.com

@@ -1,5 +1,7 @@
 $ ! vms/vmsbuild.com -- compile and link NetHack 3.5.*			[pr]
 $	version_number = "3.5.0"
+$ ! $NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$
+$ ! $Date: 2011/05/23 03:27:10 $  $Revision: 1.8 $
 $ !
 $ ! usage:
 $ !   $ set default [.src]	!or [-.-.src] if starting from [.sys.vms]