Add information how to make shelve command work with check_source.sh called from hg hook
and added coresponding flag handling in check_source.sh
<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>