6315: Inserting action group 'Bookmarks' into UI manager which already has a group with this name


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21087 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Add two experimental navigation plugins

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21088 4ae1f11a-8b86-4847-b8af-ab372f36d1fd