Resolve aliases and apply distbase.

def get_location(self, location, depth=0):
        """Resolve aliases and apply distbase.
        """
        if not location:
            return []
        if location in self.aliases:
            res = []
            if depth > MAXALIASDEPTH:
                err_exit('Maximum alias depth exceeded: %(location)s' % locals())
            for loc in self.aliases[location]:
                res.extend(self.get_location(loc, depth+1))
            return res
        if self.is_server(location):
            return [location]
        if location == 'pypi':
            err_exit('No configuration found for server: pypi\n'
                     'Please create a ~/.pypirc file')
        if self.urlparser.is_url(location):
            return [location]
        if not self.has_host(location) and self.distbase:
            return [self.join(self.distbase, location)]
        return [location]