friction ratio is being stored as a pressure in DIGGS properties.xml

[ross-cutts]

We need to change friction_ratio to dimensionless instead of pressure.

    <diggs:Definition gml:id="friction_ratio">
        <gml:description>ratio of sleeve resistance to tip resistance</gml:description>
        <gml:identifier codeSpace="https://diggsml.org/def/authorities.xml#DIGGS">https://diggsml.org/def/codes/DIGGS/0.1/properties.xml#friction_ratio</gml:identifier>
        <gml:name>Friction Ratio</gml:name>
        <diggs:dataType>double</diggs:dataType>
        <diggs:quantityClass>pressure</diggs:quantityClass>
        <diggs:occurrences>
            <diggs:Occurrence>
                <diggs:sourceElementXpath>//diggs:propertyClass</diggs:sourceElementXpath>
                <diggs:conditionalElementXpath>ancestor::diggs:measurement//diggs:procedure/diggs:StaticConePenetrationTest</diggs:conditionalElementXpath>
            </diggs:Occurrence>
        </diggs:occurrences>
    </diggs:Definition>