Update BW-DOS to version 1.4D.

Makefile

@@ -153,7 +153,7 @@ FILES=\
 # BW-DOS files to copy inside the ATR
 DOSDIR=disk/dos/
 DOS=\
-    xbw130.dos\
+    xbw14d.dos\
     copy.com\
     efast.com\
     pause.com\

disk/dos/bwdos-license.txt

@@ -1,38 +1,15 @@
+BW-DOS sources from:
+  https://github.com/dmsc/bwdos-mads
 
-        ------------------------
-            B  W  -  D  O  S
-        ------------------------
-              Version 1.30
+Original BW-DOS 1.3 by BEWESOFT
+Modifications by Holger Janz and Daniel Serpell.
 
-              By  BEWESOFT
+Sources released to public in Jun 2023.
 
-            (Released 12/95)
+From:
+  https://forums.atariage.com/topic/351486-bw-dos-v130/page/4/#comment-5319115
 
-BW-DOS is a disk operating system for
-8-bit ATARI computers with at least
-48kB RAM, and at least one disk drive.
-It is designed to be compatible with
-SpartaDOS, and to use as little memory
-as possible. In addition, several small
-bugs known from SpartaDOS are not in
-BW-DOS, especially problems with XF551.
-BW-DOS may be used separately, or as a
-"junior version" for SpartaDOS users.
-
-BW-DOS may be freely used and distri-
-buted under following conditions:
-
-- Only the whole and unchanged master
-  disk may be distributed,
-- It may not be sold, excepting little
-  costs in PD services,
-- When used as a part of another
-  software package, the whole package
-  may be marked with a "(C)", sold
-  etc.; in this case it's possible
-  to exclude files from BW-DOS, but
-  all distributed files still must be
-  unchanged, and an information where
-  the whole BW-DOS is available must
-  be included.
+I'm Jiří Bernášek, the only author of all Atari 8-bit software signed BEWESOFT,
+including BW-DOS up to version 1.30, and I release it all to the Public Domain,
+including sources where available.