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

It's the case on Darwin, and might be in other BSDs as well.
As referred in #268.
Supersedes PR #269.

Darwin fixes - duplicate & conflicting decls

fix calloc() calls

* size_t nmemb (number of elements) first, then size_t size
* do not assume char is size 1 but use sizeof()
* allocate for char, not pointer to char (found by Michael McConville,
  fixes #261)

kilobytes is the smallest unit and never has precision

Signed-off-by: Christian Hesse <mail@eworm.de>

get a useful tolal for clock meter

add missing blank

Could no longer reproduce #244 after these fixes.

remove extra space in dual meters without margins

Dynamic unit

use ASCII blank even for graphical meter in UTF-8 mode

Signed-off-by: Christian Hesse <mail@eworm.de>

Signed-off-by: Christian Hesse <mail@eworm.de>

include wctype.h for iswprint()

If the terminal has no font with braille characters we see... Nothing
useful. Use an ASCII blank at least, so we have an idea about what's
going on.

Closes #113.

Fix tree view if userland threads are hidden.

Closes PR #111.