Superleksykograf can delete unified frame.
Superleksykograf can create new unified frame.
Minor UIX corrections.
Unified frame has also assigment to user.
Schema tab is default in edit view.

Frame list refresh event.

Correct switchable list (view only user LU/Frames, expect Admin/SuperLeksykograf)

Return list of unifird frames without slowal frames assigments.

Replace slowal frame argument position.
Slowal frame status change implementation.

Revert __init__.py files

Moving selectional preference popup code from Slowal project. Making some adjustments to database models and  API.