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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

Note: dragonflybsd does not have 'jail_get' like freebsd does.
It does however provide a sysctl "jail.list" which returns a list of all jails.

Add missing include

Add Comment[zh_CN] and GenericName[zh_CN] into htop.desktop

sys/time.h for struct timeval

Apparently invalid results can be returned by buggy drivers in old laptops,
as reported by @thukydides. See #596.

Issue #502 update Session ID column

Replace all uses of sprintf with snprintf

In all the cases where sprintf was being used within htop, snprintf
could have been used. This patch replaces all uses of sprintf with
snprintf which makes sure that if a buffer is too small to hold the
resulting string, the string is simply cut short instead of causing
a buffer overflow which leads to undefined behaviour.

`sizeof(variable)` was used in these cases, as opposed to `sizeof
variable` which is my personal preference because `sizeof(variable)`
was already used in one way or another in other parts of the code.

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

and change alignment of numbers.

Real-time signals support (kill command)

Real-time signals support (kill command)

SignalsPanel_new now fetches SIGRTMIN and SIGRTMAX and generates real-
time signals entries at runtime.

All signals between SIGRTMIN and SIGRTMAX are written in "SIGRTMIN+n"
notation, per discussion in pull request #551.

Signed-off-by: Kang-Che Sung <explorer09 @ gmail.com>

Courtesy to OpenWRT environments as requested by @champtar in #540.

Fix column misalignment for priority -101 threads

BFS-patched kernels can have kernel threads with priority -101.
This change makes priority -101 display as "RT", just like priority -100.

Related: https://github.com/hishamhm/htop/issues/314

Closes #546.

Mark signal tables 'const'

Specifically, Platform_signals[] and Platform_numberOfSignals. Both are
not supposed to be mutable. Marking them 'const' puts them into rodata
sections in binary. And for Platform_numberOfSignals, this aids
optimization (aids only Link Time Optimization for now). :)
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>

Optimize Strings_startWith()

Use strncmp() combined with a strlen() will give better performance
than a strstr in worst case. Especially when the match prefix is a
constant and not a variable.

While we are at it, replace the match() function in linux/Battery.c,
which uses a naive algorithm, with a macro that does better job by
utilizing Strings_startWith().

    $ gcc --version | head -n 1
    gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
    $ uname -m
    x86_64
    $ size htop.old htop.new
       text   data    bss    dec    hex filename
     137929  15112   3776 156817  26491 htop.old
     137784  15104   3776 156664  263f8 htop.new

Signed-off-by: Kang-Che Sung <explorer09 @ gmail.com>