6417: alpha4 filtering screws up Export


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21811 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
clarify use of all_handles methods

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21813 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
6568: graphic descendant tree report inserts a bogus title


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21816 4ae1f11a-8b86-4847-b8af-ab372f36d1fd