WebStyle: canonical and alternate URLs
- Introduces support for canonical URLs, useful in case the same Invenio installation is reachable from different domains and over both HTTP and HTTPS. (addresses #1251)
- Similarly introduces support for alternate URLs (WRT i18n) to announce alternative translation for the current page.
- Introduces proper support for canonical and alternate URLs in the sitemap generation script in BibExport.
- Generally improves BibExport generation of sitemaps, by compressing via gzip, incremental creation of sitemaps, and hot-swapping. (closes #368)
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>