Added SPDX License ID to all EPICS-original source files

In some cases the license-identification header was missing,
so I added that as well. Replaced the remaining headers that
specifically identified "Versions 3.13.7 and higher".

Makefiles and the build system were deliberately excluded.

startup/EpicsHostArch

@@ -1,4 +1,10 @@
 #!/bin/sh
+#*************************************************************************
+# SPDX-License-Identifier: EPICS
+# EPICS BASE is distributed subject to a Software License Agreement found
+# in file LICENSE that is included with this distribution.
+#*************************************************************************
+
 # Script to find and run the Perl EpicsHostArch.pl script.
 
 # This script is provided for backwards-compatibility only and may be

startup/unix.csh

@@ -3,8 +3,8 @@
 #     National Laboratory.
 # Copyright (c) 2002 The Regents of the University of California, as
 #     Operator of Los Alamos National Laboratory.
-# EPICS BASE Versions 3.13.7
-# and higher are distributed subject to a Software License Agreement found
+# SPDX-License-Identifier: EPICS
+# EPICS Base is distributed subject to a Software License Agreement found
 # in file LICENSE that is included with this distribution.
 #*************************************************************************
 #

startup/unix.sh

@@ -3,8 +3,8 @@
 #     National Laboratory.
 # Copyright (c) 2002 The Regents of the University of California, as
 #     Operator of Los Alamos National Laboratory.
-# EPICS BASE Versions 3.13.7
-# and higher are distributed subject to a Software License Agreement found
+# SPDX-License-Identifier: EPICS
+# EPICS Base is distributed subject to a Software License Agreement found
 # in file LICENSE that is included with this distribution.
 #*************************************************************************
 #

startup/win32.bat

@@ -4,6 +4,7 @@ rem  Copyright (c) 2017 UChicago Argonne LLC, as Operator of Argonne
 rem      National Laboratory.
 rem  Copyright (c) 2002 The Regents of the University of California, as
 rem      Operator of Los Alamos National Laboratory.
+rem  SPDX-License-Identifier: EPICS
 rem  EPICS BASE is distributed subject to a Software License Agreement found
 rem  in file LICENSE that is included with this distribution.
 rem *************************************************************************

startup/windows.bat

@@ -4,6 +4,7 @@ rem  Copyright (c) 2017 UChicago Argonne LLC, as Operator of Argonne
 rem      National Laboratory.
 rem  Copyright (c) 2002 The Regents of the University of California, as
 rem      Operator of Los Alamos National Laboratory.
+rem  SPDX-License-Identifier: EPICS
 rem  EPICS BASE is distributed subject to a Software License Agreement found
 rem  in file LICENSE that is included with this distribution.
 rem *************************************************************************