Fix wxHMI example after upgrading wxGlade

Newer wxGlade generates code to initialize GridSizer's with empty
elements.

...
grid_sizer_1.Add(self.window_1, 1, wx.ALIGN_CENTER, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
...

That causes following traceback, if new buttons are added
to already full sizer.

PLCobject : Traceback (most recent call last):

File "./Beremiz_service.py", line 389, in default_evaluator
res = (tocall(*args, **kwargs), None)

File "/tmp/tmpQS8ct2/runtime_0.py", line 540, in _runtime_0_start
wx.MessageBox(_("Please stop PLC to close"))

File "/tmp/tmpQS8ct2/runtime_0.py", line 504, in Init
lambda axis:( MakeButtonFunc(self, sizer, axis+"axisMinus"),

File "/tmp/tmpQS8ct2/runtime_0.py", line 502, in <lambda>
lambda btname: MakeButtonFunc(self, sizer, btname), ActionButtons)

File "/tmp/tmpQS8ct2/runtime_0.py", line 461, in MakeButtonFunc
print sizer, btname

File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_core.py", line 14453, in Add
return _core_.Sizer_Add(*args, **kwargs)

PyAssertionError: C++ assertion "Assert failure" failed at
../src/common/sizer.cpp(1401) in DoInsert(): too many items (11 > 2*5)
in grid sizer (maybe you should omit the number of either rows or
columns?)


Tested with wxGlade version 0.8.3
Closes #41

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/*

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Template C code used to produce target Ethercat C code.

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Copyright (C) 2011-2014: Laurent BESSARD, Edouard TISSERANT

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Distributed under the terms of the GNU Lesser General Public License as

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published by the Free Software Foundation; either version 2 of the License, or

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(at your option) any later version.

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See COPYING file for copyrights details.

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*/

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#include "iec_types_all.h"

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#define FREE 0

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#define ACQUIRED 1

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#define ANSWERED 2

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long SDOLock = FREE;

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extern long AtomicCompareExchange(long* atomicvar,long compared, long exchange);

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int AcquireSDOLock() {

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	return AtomicCompareExchange(&SDOLock, FREE, ACQUIRED) == FREE;

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}

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void SDOAnswered() {

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	AtomicCompareExchange(&SDOLock, ACQUIRED, ANSWERED);

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}

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int HasAnswer() {

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	return SDOLock == ANSWERED;

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}

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void ReleaseSDOLock() {

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	AtomicCompareExchange(&SDOLock, ANSWERED, FREE);

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}

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int __init_etherlab_ext()

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{

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    SDOLock = FREE;

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    return 0;

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}

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void __cleanup_etherlab_ext()

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{

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}

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void __retrieve_etherlab_ext()

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{

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}

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void __publish_etherlab_ext()

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{

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}