There can be more than one feedlink group in a page, as well as (more
rarely) multiple blog forms, and using the same id for all of them
causes HTML validation errors. Replace the id with a class by the same
name and adjust in-repository CSS.
(cherry picked from commit 0c3b91e1f06fb357711cfa71d514f139cd8e04e3)
The default templates are also updated to make use of this information.
The rel="alternate" attribute is also inserted, for completeness.
(cherry picked from commit 618ade535e6a7967a510d9e210edaef3d37cc9bc)
* Add feeds=no option to inline preprocessor directive to turn off all types
of feeds. feeds=rss will still work, and feeds=atom was also added, for
fine control.
* $IkiWiki::version now holds the program version, and is accessible to
plugins.