some tabs to spaces

cd src
    grep -P -n '\t' *.c | grep -v "1:"
    cd ../include
    grep -P -n '\t' *.h | grep -v "1:"
    cd ..

side note: win/Qt/*.cpp are full of tabs

include/prop.h

@@ -1,5 +1,5 @@
 /* NetHack 3.7	prop.h	$NHDT-Date: 1596498555 2020/08/03 23:49:15 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.22 $ */
-/* Copyright (c) 1989 Mike Threepoint				  */
+/* Copyright (c) 1989 Mike Threepoint                             */
 /* NetHack may be freely redistributed.  See license for details. */
 
 #ifndef PROP_H