* Applied Jeremie Koenig's pluggable editpage buttons patch:
- add a title to the editpage form;
- pass a reference to the list of buttons to the formbuilder_setup
hooks, so we can add ours;
- relax asumption about the possible submit values (use "Save Page"
explicitly);
- de-hardcode the submit buttons from the editpage template
(This was needed for compatability with a bug in CGI::FormBuilder
3.0401, but ikiwiki already needs a newer version.)
* Pass buttons to all other formbuilder_setup hooks too.