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this way a remount of /proc will not reset starttimes
and we can also see startup times for processes started before the mount
of /proc

also record btime (boot time in seconds since epoch) as Linux semi-global

Use the same method that ps and top use to determine if a
process is a kernel thread on Linux: check if cmdline is empty.

Thanks to @wangqr's investigation reported here:
https://github.com/hishamhm/htop/issues/761#issuecomment-375306069

Fixes #761.

Linux commit 06eb61844d841d0032a9950ce7f8e783ee49c0d0 ("sched/debug:
Add explicit TASK_IDLE printing") exposes kthreads idling using
TASK_IDLE in procfs as "I (idle)".

Until now, when sorting the STATE ("S") column, htop used the raw
value of the state character for comparison, however that led to the
undesirable effect of TASK_IDLE ('I') tasks being sorted above tasks
that were running ('R').

Thus, explicitly recognize the idle process state, and sort it below
others.

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.

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

As suggested by @wolfgang42. Fixes #100.

translate dev_t to major:minor on other platforms.
Closes #316.

Display them properly. Not fully convinced of the "no perm" message...

Got a report in #397 that htop runs in NetBSD
masquerading as Linux and using a compatibility /proc
(like we used to in FreeBSD) and that it builds fine
apart from this syscall.

* 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)

Closes #228.

Read OOM data only if column is enabled.
Make sort ordering more consistent. Closes #182.

Conflicts:
	linux/LinuxProcess.c

Conflicts:
	Process.c
	Process.h
	ProcessList.c
	ScreenManager.c
	linux/LinuxProcessList.c

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