Improve DbLinkField to support '$' in the link param. This '$' will be
replaced by the primary key's value.
Add edit link on the AutoContainer classes using ViewPolicy if tws_edit_link is defined on the DB class
Display the onetomany/manytomany fields as links in the classes using ViewPolicy.
Only run elixir widget tests if it is importable.
Fix .local_name error with sqlalchemy 0.8 and greater.
Disable more elixir tests if its not importable.
Merge branch 'develop' into feature/edit_link_on_view

Conflicts:
	tests/test_widgets.py
Merge branch 'feature/edit_link_on_view' into develop