github workflow: build_setup: employ shell script, MANIFEST.in: include .hpp from lib

python/MANIFEST.in

@@ -1,4 +1,4 @@
-include *.hpp
+include lib/*.hpp
 include *.cpp
 include *.pyx
 include *.pxd

python/setup.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+cat README.md | grep '^# IMCtermite' -A 50000 > python/README.md
+cp -r lib python/
+cp -v LICENSE python