'Force immediate load of all metadata'

@classmethod
def load_all(kls):

    for (region_code, loader) in list(kls._region_available.items()):
        if (loader is not None):
            loader(region_code)
            kls._region_available[region_code] = None
    for (country_code, loader) in list(kls._country_code_available.items()):
        if (loader is not None):
            loader(country_code)
            kls._country_code_available[region_code] = None
