beremiz

file isExecutable
if there is no users matiec installation, then use system path to run iec2c

search for matiec libraries in system path as well

Closes #29
<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>