7066: bug in hebrew_ymd

merge from trunk

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@23134 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
6774: Recursive call in GEDCOM export preview calculation

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@23135 4ae1f11a-8b86-4847-b8af-ab372f36d1fd