Remove the widget from the model.
Add keyword arguments.
Separate form widgets from html widgets. HTML widgets now go
in the html_widgets module.
Update the TagMultipleSelectionForm class to be a subclass of
FilteredSelectionForm.
Move Select2 specific JavaScript from the appearence app to the
tags app.
Update tag attachment and removal view names.
Modernize tests.
Add more tests.
Consolidate repeated test code into test mixins.
Update views to comply with MERCs 5 and 6.
Use uniform nomeclature for URLs.
Update URLs parameters to use the '_id' form.
Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>
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