bug#32120: 26.1; In python.el tab-width should default to 4

[Carlos Pita]

Most python source code uses a tab step of 4 spaces. I think it doesn't
make a lot of sense to default tab-width to 4. Maybe there is a reason
I'm failing to grasp.

---

In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-05-29 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:     Manjaro Linux

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Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
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 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 MODULES THREADS LIBSYSTEMD LCMS2

Important settings:
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Major mode: Emacs-Lisp

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Load-path shadows:
None found.

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Memory information:
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