Fix long columns of text that span pages

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@23453 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Added callback parameter to __init__ method so that all editors have a uniform signature (called from Note Link)

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@23454 4ae1f11a-8b86-4847-b8af-ab372f36d1fd