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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.

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.

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

Reduces resulting code size.

Avoid unnecessary operations when processing entries on ProcessList.

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