FeedGroup::insertChild(): if "after" is not a child, prepend instead of append.
FeedGroup::insertChild(): if "after" is not a child, prepend instead of append.

svn path=/trunk/kdepim/akregator/; revision=375931

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi