preselect the template of the source in the template tree


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/geps/gep-018-evidence-style@22452 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
automatic creation of needed fields


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/geps/gep-018-evidence-style@22453 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
GEP 18: automatic setting of fields, and updating attribute list


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/geps/gep-018-evidence-style@22454 4ae1f11a-8b86-4847-b8af-ab372f36d1fd