bake: Tweaks to the `sitemap` processor. Add tests. * Now using a `PageIterator` to get the expected behaviour from a given page source, such as skipping taxonomy pages and such. * Fix formatting of priority. * Use the bake time for `lastmod` attribute.

import os


def slashfix(path):
    if path is None:
        return None
    if isinstance(path, str):
        return path.replace('/', os.sep)
    fixed = []
    for p in path:
        fixed.append(p.replace('/', os.sep))
    return fixed