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

     1

# SOME DESCRIPTIVE TITLE.

     2

# Copyright (C) is 21st century inquisition

     3

# This file is distributed under the same license as the Beremiz package.

     4

# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.

     5

#

     6

#, fuzzy

     7

msgid ""

     8

msgstr ""

     9

"Project-Id-Version: Beremiz 1.1\n"

    10

"Report-Msgid-Bugs-To: \n"

    11

"POT-Creation-Date: 2012-09-08 01:21\n"

    12

"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"

    13

"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"

    14

"Language-Team: LANGUAGE <LL@li.org>\n"

    15

"Language: \n"

    16

"MIME-Version: 1.0\n"

    17

"Content-Type: text/plain; charset=UTF-8\n"

    18

"Content-Transfer-Encoding: 8bit\n"

    19

    20

# a26a331ecf054e3aa817af29a4e12a50

    21

#: ../../manual/index.rst:2

    22

msgid "Beremiz's user manual"

    23

msgstr ""

    24

    25

# 38e05e035be242e7861d0dadb295e6a3

    26

#: ../../manual/index.rst:4

    27

msgid "Contents:"

    28

msgstr ""