beremiz

file isExecutable
fix bug: Beremiz IDE hangs during launching Beremiz_service

this is regression introduced as side effect by d7f474d [fix issue
with sometimes wrong return code of ProcessLogger]
<xsd:element name="Xenomai">
<xsd:complexType>
%(toolchain_gcc)s
<xsd:attribute name="XenoConfig" type="xsd:string" use="optional" default="xeno-config"/>
</xsd:complexType>
</xsd:element>