Create __all__ for all python files (#589)

* add __all__ to files "adjustmentsinfo.py" and "albuminfo.py"

* add __all__ to file "cli.py"

* add __all__ to all files that misses except files with prefix "_"

osxphotos/pyrepl.py

@@ -1,3 +1,5 @@
+
+__all__ = ["PyReplQuitter", "embed_repl"]
 """ Custom Python REPL based on ptpython that allows quitting with custom keywords instead of `quit()` """
 
 """ This file is distributed under the same license as the ptpython package: