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htop fails to compile with:

```text
SignalsPanel.c:32:49: error: use of undeclared identifier 'Platform_signals'
      Panel_set(this, i, (Object*) ListItem_new(Platform_signals[i].name, Platform_signals[i].number));
                                                ^
1 error generated.
*** Error code 1
```

Implementations for Linux (tested) and FreeBSD (still untested, thanks to @etosan for providing the table).
Darwin and OpenBSD(ping @mmcco) builds should be broken now, pending their own tables.

Cleanup and initial OpenBSD support

add editorconfig file to give hints to editors

We use an unusual indent of three spaces. Let's give editors a hint
about that.

Added preliminary attempt at jails support on FreeBSD - JID and JAIL (name) columns

Added preliminary attempt at jails support on FreeBSD - JID and JAIL (name) columns, somewhat more correct kernel "thread" detection.

Seems FreeBSD kernel can spawn both kernel processes (what is what htop currently sees) and kernel threads.
For now let's consider kernel processes kernel "threads".

Update htop.desktop (FR l10n)

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

fix

Mac build fixes

This one is adding FR localisation to the desktop file.
Cheers.

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.