Unexport Handler for models

Should not export the handle functions for models for package coherence.

changed milestone to %Generic election

added Backend To Do bug labels

changed due date to May 19, 2020

added Doing label and removed To Do label

created branch 19-unexport-handler-for-models to address this issue

mentioned in merge request !11 (merged)

closed via merge request !11 (merged)

mentioned in commit 3b3119d8