beremiz

file isExecutable
- 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)
<xsd:element name="Rtai">
<xsd:complexType>
%(toolchain_gcc)s
<xsd:attribute name="rtai_config" type="xsd:string" use="optional" default="/usr/realtime/"/>
</xsd:complexType>
</xsd:element>