'Filters (if `neg` == True, filters out) one particular
country, or a list of countries.'

@staticmethod
def searchcountry(country, neg=False):

    country = utils.country_unalias(country)
    if isinstance(country, list):
        return {'infos.country_code': {('$nin' if neg else '$in'): country}}
    return {'infos.country_code': ({'$ne': country} if neg else country)}
