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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

Fix FreeBSD CPU bars calculation

3 effects in this commit, with the first being the main one:

1. Fix the "`missing' script is too old or missing" warning. See:
   <https://lists.gnu.org/archive/html/automake/2010-08/msg00108.html>

2. By moving AC_CANONICAL_TARGET down in order, we are now able to
   set the directory for auxiliary scripts. For now it's still './'.
   I added the line "AC_CONFIG_AUX_DIR([.])" to show that the directory
   change is possible.

3. AC_USE_SYSTEM_EXTENSIONS includes checks from AC_PROG_CC, by moving
   the former macro down, we can save size in 'configure' by not
   generating repeated checks.

AC_HELP_STRING -> AS_HELP_STRING
AC_TRY_COMPILE -> AC_COMPILE_IFELSE([AC_LANG_PROGRAM([...])],...)
AC_CONFIG_HEADER -> AC_CONFIG_HEADERS
AC_PROG_LIBTOOL -> LT_INIT

Note: There might be more deprecated macros that I haven't noticed.
I just wish to avoid painful highlighting from my text editor (gedit)
that complains about them. :)

Fix macro Header_forEachColumn

The (this_) token was not expanded properly, but the bug was not caught
because all uses of this macro specifies (this_)=this .

Also parenthesize macro tokens to prevent further problems.

See #237.

Closes #480.

Use Linux backend on the Hurd

Fix a typo in the man page (Debian Lintian spelling-error-in-manpage)

Add Keywords entry to .desktop file (Debian Lintian warning desktop-e…

Use a SOURCE_DATA_EPOCH friendly date.
Suggested by @fasterit in #476.