get the plnpluginimport command working again after I broke it with API changes in the CRUD bundle.
Get the plntitledbimport command working again.

 - Make Aus::__toString() return something, even if it is a useless thing.
 - relax all of the null restrictions on Aus.orm.yml
 - Have AuProperties cascade persistence to parents and children as necessary.
 - Many changes to the actual command file.