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Closes #241.

Read OOM data only if column is enabled.
Make sort ordering more consistent. Closes #182.

Conflicts:
	Process.c
	Process.h
	ProcessList.c
	ScreenManager.c
	linux/LinuxProcessList.c

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

(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.

removes some basic checks that succeed on most systems anyway and which cause problems for the uClibc folks. Closes #3204565.

(thanks to Moritz Barsnick)

(as suggested by Andy Kennedy)

* BUGFIX: Correct page size calculation for FreeBSD systems
  (thanks to Andrew Paulsen)
* Allow compilation without PLPA on systems that don't support it
  (thanks to Timothy Redaelli)