Use backend specific sortby and sortable_columns method, to be able to

Use backend specific sortby and sortable_columns method, to be able to
select between native (Db backend) and custom (PageList) sorting.
Fixed PageList::AddPageList (missed the first)
Added the author/creator.. name to AllPagesBy...
  display no pages if none matched.
Improved dba and file sortby().
Use &$request reference

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@3889 96ab9672-09ca-45d6-a79d-3d69d39ca109