fix issue that sometimes period for cyclic task wasn't saved.

This is complete fix for the problem described in 8626bba.

add first steps example, that shows how use all IEC 61131 languages

fix issue with empty frame with generated ST code

fix not saving location address from variable panel

this regression was introduced by commit 3518d10

add $(Beremiz installation)/mingw/bin in PATH on Windows platform

This fixes issue if multiple gcc installation are found in user's
PATH. Now gcc from Beremiz is used by default.

fix issue with non-working global hotkeys in IEC code panel

add more comments to svgui example

cleanup traffic lights example

cleanup svgui example

Fix bug with two or more wires connected to one input. Now only one wire can be connected to one input, except BOOLean signals in LD and SFC. If user trying to connect wire with already connected input, wire highlight will become red.
Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>

fix issue with sequence of multiple whitespaces in makefile command
line from project configuration

for every additional whitespace '""' was inserted in result command line.

fix minor issue and do some cleanup work in genericmake example

cleanup python example

complete fix in commit 3518d10 for wxgtk2.8

fix syncronization issue during killing ProcessLoggers on IDE close

Add russian translation on label "Tick" in debug variable panel.

Add russian language in Project properties -> Other menu.

fix issue, that was impossible to change variable location IEC-address, when wx 3.0 is used

Merge

fix infinite recursion in 'Reset Execution Order' functionality if FBD body contains feedback connections

fix issues in PLCOpenEditor with moving from wxWidgets 2.8 to 3.0

1)
./PLCOpenEditor.py:63: wxPyDeprecationWarning: Using deprecated class PySimpleApp.
app = wx.PySimpleApp()

2)
./PLCOpenEditor.py:475: wxPyDeprecationWarning: Call to deprecated item.
wx.InitAllImageHandlers()

3)
Traceback (most recent call last):
File "./PLCOpenEditor.py", line 480, in <module>
frame = PLCOpenEditor(None, fileOpen=fileOpen)
File "./PLCOpenEditor.py", line 163, in __init__
IDEFrame.__init__(self, parent)
File "/tmp/f/beremiz/IDEFrame.py", line 657, in __init__
self._init_ctrls(parent)
File "/tmp/f/beremiz/IDEFrame.py", line 485, in _init_ctrls
self._init_icon(prnt)
File "/tmp/f/beremiz/IDEFrame.py", line 476, in _init_icon
if self.icon:
AttributeError: 'PLCOpenEditor' object has no attribute 'icon'

update messages and add Russian translation for new menu entry 'switch perspective'

Merged in Surkovsv/beremiz (pull request #4)

Add hotkey (F12) for switching perspective.

Add hotkey (F12) for switching perspective.

Switching perspective feature hides/restores all panels except of the main editor window for current FB.
So all available screen space is used for editor.