[Ideas] [DBCleaner_API] More actions

The new DBCleaner API is very usefull, but it could have some more actions like:

- Espace_ListDeleted
- Espace_Delete

This two actions could eliminate all the trace of deleted eSpaces in the environment database.

Another one could be:

- Attribute_DropAll

Since we can have hundreds of deleted attributes in DEV environments, and deletting one by one can be painfull.