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Two changes in this commit:
- All meters now explicitly specify "maxItems" property, even for just
  1 item. (Exception is "container" CPU meter classes, which use
  CUSTOM_METERMODE.)
- "maxItems" being 0 is now allowed. This will let bar meters and graph
  meters render an empty meter.

This is a work-in-progress, code is currently broken.
(Some actions, and notably, the header, are missing.)

(Patch by Dawid Gajownik)

See https://bugzilla.redhat.com/show_bug.cgi?id=987805 for details.
(thanks to Dawid Gajownik for the detailed analysis!)

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

* 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 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

(Fix by Steven Hampson)

Reduces resulting code size.

accurate description. It is still available in
split time, now called detailed CPU time.
(thanks to Samuel Thibault for the report)

(minor modifications: default to false, add help)

Avoid unnecessary operations when processing entries on ProcessList.

- add AllCPUsMeter;
- because of that, the new .htoprc is incompatible with previous released versions.