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The software is licensed under GPL-2.0-or-later. But list.c and list.h
contain source code I edited from book "C Primer Plus" Chapter17
practice problem 2 which contain codes from its example codes, and the
author of "C Primer Plus" does not have a license for list.c and list.h,
so the author of "C Primer Plus" has the copyright on list.c and list.h,
so list.c and list.h can be considered non-free close souce proprietary
code.
I choose GPL-2.0-or-later. Because I prefer GPL over LGPL. And because
libssh's LGPL-2.1-or-later, plplot's LGPL-2.0-or-later, and gtk's
LGPL-2.1-or-later licenses are compatible with GPL-2.0-or-later.
This commit also clarify licensing by copy the GPL-2.0-or-later license
to LICENSE file, adding notes in README.md, and adding
SPDX-License-Identifier and other licensing comment in source code
files.
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