entity_to_dict for Information now includes Producer objects.

Previously only produer names. Doesn't cause infinite loops but BEWARE!!! May cause them in the future if other parts of entity_to_dict are changed in a similar fashoon.
Added max_depth parameter to entity_to_dict.

Oops! entity_to_dict DID produce infinite loops.
But now it doesn't, thanks to the max_depth parameter (defaults to 3).
Bugfix, now returns when max_depth has been crossed. :)
more work on search tab.

Kind of works but entity_to_dict loops infiniteyl :((:(:( despite my exceptional work.
Merge branch 'master' of https://github.com/mvk-team42/Veracitor