fix many compilation warnings about static variables used by non-static functions

[CC] plc_main.c -> plc_main.o
/tmp/be/build/plc_main.c:396:40: warning: ?LogBuff? is static but used in inline function ?copy_from_log? which is not static
memcpy((char*)buf + remaining, LogBuff[level], size - remaining);
^
/tmp/be/build/plc_main.c:395:22: warning: ?LogBuff? is static but used in inline function ?copy_from_log? which is not static
memcpy(buf, &LogBuff[level][buffpos], remaining);
^
...

^
/tmp/be/build/plc_debugger.c:825:20: warning: ?retain_offset? is static but used in inline function ?BufferIterator? which is not static
Retain(retain_offset, size, real_value_p);
^
/tmp/be/build/plc_debugger.c:823:47: warning: ?retain_offset? is static but used in inline function ?BufferIterator? which is not static
unsigned int next_retain_offset = retain_offset + size;
^
^

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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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