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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>

Change scrolling behavior to make it more similar to other applications.

Commit "Make PgDown behavior more usual." 759caf0f
silently changes the PageDown scrolling behavior that, instead of
scrolling one window down until the end of the window touches the end
of the list, the window simply repositions itself in a way that the
selected item always become the last item in the new window.

The commit reverts the behavior, and also fixes sanity conditionals
so that the scrollV variable will _never_ become negative or out-of-
bound.

Fixes issue #532. Also keep the problem #480 addressed.

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

Let BarMeterMode_characters[] be const array.

Allow to override ncurses*-config path

This will be used when cross-compiling with ncurses*-config generated for the
target, using constructs like
HTOP_NCURSES_CONFIG_SCRIPT=/path/to/ncurses5-config
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>

Closes #520.

* Dynamically adjust the size of line reads.
* Remove some more uses of fgets with arbitrary sizes.
* Fix reading of lines and width of n column.

Fixes #514.

Document Alt+{h,j,k,l} and Ctrl+{A,E} into man page

Rewrite the scrolling part in the man page so that each key become clearer on
what it does. Also officially document the Alt+{h,j,k,l} key alternatives and
Ctrl+A, Ctrl+E, '^', '$' keys (see issue #508).

(Also, '^' and '$')
Closes #508.

Fix xStrdup debug build failure & allow Clang to use ((nonnull))

Fixes upon xStrdup(NULL) problem

__attribute__((nonnull)) will help catching "calling with NULL" mistake on
compile time.

I also convert xStrdup into a macro, that will do assert() inline when the
code is *not* built with -DNDEBUG . For release builds (with -DNDEBUG),
preprocessor trick will ensure that generated code remains the same.