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Change more fprintf(stderr, ...); exit(...); to err[x](...). Tweak a few existing ones and fix some style.

Fixes #174.

Conflicts:
	Panel.c

Fixes #174.

Kinda runs, but functionality from the original main loop
is still missing. Patience.

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

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

Ensure one mini-reading-cycle runs before getting the UI active
so we have two data points to get better meter measurements from
the get-go.

but the current process will remain selected (so you can filter, choose and
then go back to unfiltered mode to see the children of that process).

Inspired by feedback at http://www.reddit.com/r/linux/comments/23wpc7/announcing_htop_103_with_new_features_bugfixes/ch1paos

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.

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

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

This avoids killing the wrong process.