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Made the logic more modular, hopefully easier to follow,
and removed repeated code.
Plus, some optimization in RichString code.

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

(thanks to Jann Horn)

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

(thanks to Rob Hoelz)

persistence of mouse selections. Closes #3165065.

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 )

(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

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

clicking column titles (click again to invert order).
Also, add a consolidated IO kbyte/s column.

Reduces resulting code size.

enabled with the --enable-taskstats flag, which
requires a kernel compiled with taskstats support.
Thanks to Tobias Oetiker!

When user threads are hidden, process now shows the
sum of processor usage for all processors. When user
threads are displayed, each thread shows its own
processor usage, including the root thread.
(thanks to Bert Wesarg for the report)
Also, add option to display thread colors differently.

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

Make dumping of proc data controlled by a separate debug define.

(minor modifications: default to false, add help)

disable useless code in release builds such as runtime type-checking on
dynamic data structures and process fields that are not being computed,
faster(?) method for verifying the process owner (still need to ensure
correctness), don't destroy and create process objects for hidden kernel
threads over and over. Phew. I shouldn't be doing all this today, but I
could not resist.

* Support for generating a /proc trace for debugging purposes.