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Adds support for showing columns with linux delay accounting.

This information can be read from the netlink interface, and thus we set up a socket to read from that when initializing the LinuxProcessList (LinuxProcessList_initNetlinkSocket). After that, for each process we call LinuxProcessList_readDelayAcctData, which sends a message thru the socket after setting up a callback to get the answer from the Kernel. That callback sets the process total delay time attribute. We then set the delay percent as the percentage of time process cpu time since last scan.

GCC 7.x does some extended checks on fallthough for switch/case
statement. The warning looks like this:

warning: this statement may fall through [-Wimplicit-fallthrough=]

It can be told about implicit fallthough, however it does not
recognize comments within blocks, so move the comments outside.

Remove libtool references

The project builds a single standalone binary.

There are no libraries created - be that static or shared ones.
Thus there's no need for libtool.
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

Find roots when constructing process tree, fix #587

make script version agnostic

Calls marked with xSnprintf shouldn't fail.
Abort program cleanly if any of them does.

Round values in graph drawing (instead of implicit truncate)

This is/was necessary only on macOS, because you needed root in order
to read the process list. This was never necessary on Linux, and
it also raises security concerns, so now it needs to be enabled
explicitly at build time.

more const usage

Settings: do not emit trailing whitespace

Several string pointer arrays pointed to const strings
but were not const themselves.

A few various structures and arrays were also marked const.

Thanks @Sworddragon for the heads up.
See #88.

Closes #648.

DragonFlyBSD PID_MAX is 999999.

See DragonFlyBSD source "sys/sys/proc.h".

Fixes #646

As suggested by @wolfgang42 in #100.

As suggested by @wolfgang42. Fixes #100.

make special keys also work with TERM=xterm-256color

Mouse-friendly functions bar for meters panel

update keymap in help

Initial addition of dragonflybsd (based on FreeBSD)

Enh: scripts/MakeHeader script

Only write a new .h file if something changed for the header file being created.
This prevents a lot of recompilation during development