More Python/pip package cleanup : version 2.0.17.

Generate astronomy.py directly in the package directory.
I realized it doesn't make sense to generate it in the
parent directory and then copy it; just generate it where
it will end up anyway.

Updated documentation so people know they can just do

    pip install astronomy-engine

to install Astronomy Engine in their Python project.

Removed the GitHub Actions status badge because it is redundant with
the checkmark/X indicator.

Now that private symbols are no longer exported, I had to
fix a couple of places where the unit tests still accessed them.

source/python/README.md

@@ -7,8 +7,22 @@ See the [home page](https://github.com/cosinekitty/astronomy) for more info.
 ---
 
 ## Quick Start
-To include Astronomy Engine in your own Python program, all you need is
-the file `astronomy.py` from this directory.
+To include Astronomy Engine in your own Python program,
+you can use the [astronomy-engine](https://pypi.org/project/astronomy-engine/) package:
+
+```
+pip install astronomy-engine
+```
+
+Alternatively, you can copy the file [astronomy/astronomy.py](astronomy/astronomy.py)
+into your project directory.
+
+With either approach, add the following line toward the top of your program:
+
+```python
+import astronomy
+```
+
 
 To get started quickly, here are some [examples](../../demo/python/).
 

source/python/astronomy/.gitignore

@@ -1 +0,0 @@
-astronomy.py

source/python/publish

@@ -1,6 +1,5 @@
 #!/bin/bash
 rm -f dist/*
-cp -v astronomy.py astronomy/astronomy.py || exit $?
 python3 -m build || exit $?
 python3 -m twine upload --repository astronomy-engine dist/* || exit $?
 exit 0

source/python/setup.py

@@ -2,7 +2,7 @@ from setuptools import setup
 
 setup(
     name='astronomy-engine',
-    version='2.0.16',
+    version='2.0.17',
     description='Astronomy calculation for Sun, Moon, and planets.',
     long_description=open('README.md').read(),
     long_description_content_type='text/markdown',