beremiz

- now call load, start, free PLC from the python Thread

- add a wx timer (500ms) that pull the plc state to refresh Beremiz icons
(fix problem when command PLC with the TaskBar icon)
<?xml version="1.0" encoding="UTF-8"?>
<BeremizRoot URI_location="LOCAL://">
<TargetType>
<Linux CFLAGS="-g -fPIC" LDFLAGS="-g -fPIC"/>
</TargetType>
</BeremizRoot>