[PATCH] doc: Various fixes to makedocbook for python3.8

[Jon Turney]

On 24/08/2020 13:58, Ken Brown via Cygwin-apps wrote:
> On 8/24/2020 6:31 AM, Marco Atzeri via Cygwin-apps wrote:
>>
>> Any preference ? For the last option I will use alternatives

> It should default to python3.  Fedora performs this via an extra package
> python-unversioned-command, containing just a symlink /usr/bin/python ->
> ./python3 as well as a man page symlink /usr/share/man/man1/python.1.gz
> -> ./python3.1.gz.  We could just do the same, no?

Seems like a good idea.

> 
> I think it's time to make python point to python3.  I suggest setting
> 
>    /usr/bin/python -> python3

But we'd also need to audit that all packages that containing python 
scripts either:

- use a shebang which names python and work with python3
- use a shebang which explicitly names python2 or python3