We add script packages to keep track of system package information for Tcl/tk and the python _tkinter module

https://doc.sagemath.org/html/en/installation/source.html#tcl-tk

https://github.com/3-manifolds/fix_mac_sage/tree/master/fix_mac_sage9_2

https://www.tcl.tk/software/tcltk/download.html

https://github.com/python/cpython/blob/master/setup.py#L1814

System package info:

• https://repology.org/project/tcl/versions
• https://repology.org/project/tcl-tk/versions
• https://repology.org/project/python3-tkinter/versions

CC: @slel @dimpase @NathanDunfield @culler

Component: packages: optional

Author: Matthias Koeppe

Branch/Commit: u/mkoeppe/script_packages_for_tk__python__tkinter_module__update_documentation @ ca1eaf8

Issue created by migration from https://trac.sagemath.org/ticket/31206