Determine wheter an obo 'Term' entry is marked as obsolete.

    :param oboTerm: a dictionary as return by
        :func:`maspy.ontology._attributeLinesToDict()`

    :return: bool

def _termIsObsolete(oboTerm):
    """Determine wheter an obo 'Term' entry is marked as obsolete.

    :param oboTerm: a dictionary as return by
        :func:`maspy.ontology._attributeLinesToDict()`

    :return: bool
    """
    isObsolete = False
    if u'is_obsolete' in oboTerm:
        if oboTerm[u'is_obsolete'].lower() == u'true':
            isObsolete = True
    return isObsolete