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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.

Rename Meter.setValues() functions to updateValues()

Rationale (copied from htop issue #471):
The function name "setValues" is misleading. For most OOP (object-
oriented programming) contexts, setXXX functions mean they will change
some member variables of an object into something specified in
function arguments. But in the *Meter_setValues() case, the new values
are not from the arguments, but from a hard-coded source. The caller
is not supposed to change the values[] to anything it likes, but
rather to "update" the values from the source. Hence, updateValues is
a better name for this family of functions.

Remove needless allocation error conditions

These allocations were converted to use xMalloc et al. and no longer
need error checks.

This reverts commit f554f08f.

Debian patch from
https://anonscm.debian.org/cgit/collab-maint/htop.git/tree/debian/patches/002-lintian-warning-fix-desktop-keywords.patch

Debian patch from
https://anonscm.debian.org/cgit/collab-maint/htop.git/tree/debian/patches/001-lintian-warning-fix-man-typo.patch

BarMeterMode_draw() minor code improvement

Removed a loop that sets the bar[] buffer with spaces and merged that
task to the snprintf() call just below. No need for the barOffset
variable. Display behavior is unchanged.

Size comparision (when compiled on Ubuntu 14.04 64-bit):

    $ size htop.old htop.new
       text    data     bss     dec     hex filename
     137312   15112    3776  156200   26228 htop.old
     137216   15112    3776  156104   261c8 htop.new

Assert (Platform_meterTypes[0] == &CPUMeter_class)

Just assume Platform_meterTypes[0] is always &CPUMeter_class for every
platform. This removes a conditional in AvailableMetersPanel_new().

Also adds some comments about the logic here. Without assuming
Platform_meterTypes[0], the (int i=1) clause in this for loop will not
make sense. (I.e. Why not (int i=0)? )

Also replaced a sprintf() call with safer snprintf() in code further
below.

Explicit "maxItems" property of meters