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Test by nesting 30 shells
Patch from ArchLinux. Closes #65.

For now rates won't be colored gray when zero; I'll think about that.

see http://0xff.me/htop_bug.png

(Patch by Dawid Gajownik)

On my machine, this gives a ~20% improvement in htop process time use with the default config.

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

(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.

(thanks to Bin Guo)

  (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