#5724 Some cleanups for Python code

[Jonas Hahnfeld]

Some cleanups for Python code

Individual changes:
1) Update documentation for Python 3

2) Use gettext.install() for translations

This conveniently installs _() into Python's builtins namespace.

3) Drop require_python_version()

The implemented 'help' for the user by opening the browser does
not work on Linux anyway.

4) Suggested changes for a newer version of Python

Some comments already referred to simpler code, let's do it.

http://codereview.appspot.com/551430044

[Anonymous]

Passes make, make check and a full make doc.

[Anonymous]

Patch on countdown for Feb 6th.

[Anonymous]

Patch counted down - please push.

[Jonas Hahnfeld]

pushed to staging

commit bb52caf630fcbebb8390b02fb8bbe54dbaa1be9b
Author:     Jonas Hahnfeld <hahnjo@hahnjo.de>
AuthorDate: Sat Feb 1 15:56:48 2020 +0100
Commit:     Jonas Hahnfeld <hahnjo@hahnjo.de>
CommitDate: Thu Feb 6 12:02:32 2020 +0100

    Issue 5724/4: Suggested changes for a newer version of Python

    Some comments already referred to simpler code, let's do it.

commit 3baffb595e43751f11a1055dc6869a77c6bc9bee
Author:     Jonas Hahnfeld <hahnjo@hahnjo.de>
AuthorDate: Sat Feb 1 15:55:27 2020 +0100
Commit:     Jonas Hahnfeld <hahnjo@hahnjo.de>
CommitDate: Thu Feb 6 12:02:28 2020 +0100

    Issue 5724/3: Drop require_python_version()

    The implemented 'help' for the user by opening the browser does
    not work on Linux anyway.

commit 81647c9df7b2e972b8d0a00bb5f63742000511a7
Author:     Jonas Hahnfeld <hahnjo@hahnjo.de>
AuthorDate: Sat Feb 1 15:53:27 2020 +0100
Commit:     Jonas Hahnfeld <hahnjo@hahnjo.de>
CommitDate: Thu Feb 6 12:02:24 2020 +0100

    Issue 5724/2: Use gettext.install() for translations

    This conveniently installs _() into Python's builtins namespace.

commit ede0457988716a5e6fa0dd1757db0ebd96107bbc
Author:     Jonas Hahnfeld <hahnjo@hahnjo.de>
AuthorDate: Sat Feb 1 15:46:26 2020 +0100
Commit:     Jonas Hahnfeld <hahnjo@hahnjo.de>
CommitDate: Thu Feb 6 12:02:15 2020 +0100

    Issue 5724/1: Update documentation for Python 3