'Evaluates all option values in environment `loc`.
:See: `eval()`'

def evalall(self, loc=None):

    if ('N' in list(loc.keys())):
        popsize = self('popsize', Options.defaults()['popsize'], loc)
        for k in list(self.keys()):
            self.eval(k, Options.defaults()[k], {'N': loc['N'], 'popsize': popsize})
    return self
