Rework LICENSE files for GitHub

Hopefully this is still clear and will show up better in the GitHub UI.

COPYING.txt

@@ -1,7 +1,13 @@
-This repository is licensed Apache-2.0 except for
-the docs/ directory which is mostly licensed CC-BY-SA-4.0 instead.
-Which license applies is noted inside each file near the top.
+# Notice Regarding Separate Licensing of Documentation #
 
-See the setup/LICENSE.txt and docs/CC-BY-SA-4.0.txt files for the full text of each license.
+See LICENSE.txt for the full text of the Apache-2.0 license.
+See docs/LICENSE.txt for the full text of the CC-BY-SA-4.0 license.
 
-The docs/hissp.svg and docs/H.svg logos are trademarks.
+Apache-2.0 applies to most of the repository, but CC-BY-SA-4.0 applies
+to most of the files in the docs/ directory. Check the individual files;
+which license applies is noted inside each near the top.
+
+The docs/hissp.svg and docs/H.svg logos are trademarks.
+
+(Hissp package-only distributions do not include the extra documentation
+or this notice.)

setup.py

@@ -2,15 +2,19 @@
 # Copyright 2019, 2020, 2021, 2022, 2023 Matthew Egan Odendahl
 # SPDX-License-Identifier: Apache-2.0
 import os
+import shutil
 import sys
 
 import setuptools
 
-os.chdir("setup")
+os.makedirs("setup", exist_ok=True)
+shutil.copy("LICENSE.txt", "setup/LICENSE.txt")
 
-with open("../README.md", encoding="utf8") as f:
+with open("README.md", encoding="utf8") as f:
     long_description = f.read()
 
+os.chdir("setup")
+
 sys.path.insert(0, "../src")
 import hissp