wrap Beremiz startup code into separate launcher class

this should make it easier to make customized version of Beremiz IDE.
It's easy to add own splash, change version, add/disable extensions
and many other things.

For example:

[----- MyBeremiz.py ------]
#!/usr/bin/env python
from BeremizIDELauncher import BeremizIDELauncher

class MyBeremizIDELauncher(BeremizIDELauncher):
def __init__(self):
BeremizIDELauncher.__init__(self)
self.splashPath = self.Bpath("", "splash.png")

def ShowSplashScreen(self):
# comment next line to disable splash entirely
BeremizIDELauncher.ShowSplashScreen(self)

# change version
import version
version.app_version = "3.141-rc52"

def LoadExtensions(self):
# add/modifine list of extensions
# in self.extensions
BeremizIDELauncher.LoadExtensions(self)

if __name__ == '__main__':
beremiz = MyBeremizIDELauncher()
beremiz.Start()

[-------------------------]

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Beremiz installation 

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====================

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Windows

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-------

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Download installer, install. 

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Linux

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-----

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Pre-requisites::

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    # Ubuntu/Debian :

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    sudo apt-get install python-wxgtk2.8 pyro mercurial

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    sudo apt-get install build-essential bison flex python-numpy python-nevow

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Prepare::

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    mkdir ~/Beremiz

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    cd ~/Beremiz

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Get Source Code::

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    cd ~/Beremiz

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    hg clone http://dev.automforge.net/beremiz

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    hg clone http://dev.automforge.net/plcopeneditor

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    hg clone http://dev.automforge.net/matiec

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Build MatIEC compiler::

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    cd ~/Beremiz/matiec

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    ./configure

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    make

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Build CanFestival (optional):: 

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    # Only needed for CANopen support. Please read CanFestival 

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    # manual to choose CAN interface other than 'virtual'::

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    cd ~/Beremiz

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    hg clone http://dev.automforge.net/CanFestival-3

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    cd ~/Beremiz/CanFestival-3

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    ./configure --can=virtual

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    make

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Launch Beremiz::

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    cd ~/Beremiz/beremiz

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    python Beremiz.py

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