get  only subgroups by parent id
make sure that at least on property is set
add an event listener to models

Use the joomla onBefore store to log changes to to models
make the select at least on string global
add array logic to the transform

rather than just support strings in the renderer transform config, now
we can support an array or transform
batch update is only available on the registered member list

batch update is only available on the registered member list
add the batch update function
add the member level to the filters
fix minor bug