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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.

This effectively reverts "Stricter strdup." 4674b4a7

If str is NULL upon the calling of strdup(), it should crash with SIGSEGV.
Just let it crash. Adding the "if (!str) fail();" code serves nothing but
bloat.

Remove redundant is-null checks on free(Meter.drawData)

Closes #483.

configure.ac fixes

FreeBSD: fix multithreaded CPU% in process list