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Closes #42.

It is now accessible via F6 when on tree view (as a bonus, it is
now also reachable via the mouse). The function bar now dynamically
changes to reflect the toggle nature of the tree-view mode (F5)
and the F6 key serves as expand/collapse when on tree mode,
and its previous behavior of bringing up the "Sort By" menu
(which only made sense on non-tree mode). Users wishing to go to
the "Sort By" menu straight from Tree View can still do so with the
"<" and ">" keys (the top-compatible keys for sort selection).

Add missing check for return value and be more conservative in constructs to avoid future slips of this kind.

Added additional column to monitor OOM killer score of each process

fix column shift on wrong megabytes format

Possible to regenerate headers outside of srcdir

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

(Patch by Dawid Gajownik)

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

(thanks to Patrick Marlier)

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

(thanks to Jann Horn)

Don't end up killing init if process selected to be killed terminates before the user selects a signal. Closes #3606072.