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so that home directories can be used with both old and new versions of htop
(see #3496731).

Thanks to Kelly Anderson.

persistence of mouse selections. Closes #3165065.

I could not reproduce the crash in current SVN 
(I've been adding checks for problems like this),
but the sanity check looks correct.
Thanks to Cybjit. Closes #3481053.

(thanks to Trond Endestrol)

respecting $XDG_CONFIG_HOME 
(thanks to Hadzhimurad Ustarkhan for the suggestion.)

Keep panel structure up-to-date as process list changes when headers are updated during the screen manager. Hopefully closes #3444533.

(for details see https://sourceforge.net/mailarchive/forum.php?thread_name=CAJpkDYeZpwqcWxZ77wq6bMrnhn-KzkU1xAqb3cU0drfnA3n9FQ%40mail.gmail.com&forum_name=htop-general )

* Performance improvements
* Support for splitting CPU meters into two or four columns
  (thanks to Wim Heirman)
* Switch from PLPA, which is now deprecated, to HWLOC.
* Bring back support for native Linux sched_setaffinity,
  so we don't have to use HWLOC where we don't need to.
* Support for typing in user names and column fields in selection panels.

Factored code from the SignalsPanel to apply to all selections from main screen.
Closes feature request #3425304.

(thanks to Bin Guo)