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Don't end up killing init if process selected to be killed terminates before the user selects a signal. Closes #3606072.

Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers.

This avoids killing the wrong process.

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.

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)

plus some fixes

(thanks to Sebastian Pipping)

  (thanks to Sean Noonan)
* Meters update in every screen (no longer halting while on Setup, etc.)

Fix subtree hiding
Fix reading of CPU values in hidden threads
Fix hiding of zombie processes as kernel threads
Remove "debug proc" code
Code cleanup in processElements

simplify processor data accounting (add CPUData structure)
remove Process_clone trick