Authbwc

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* added SQLAlchemyBWC requirement to match usage
* refactor form submission email notifications for easier overrides

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* replaced DatagridBWC usage with WebGrid

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* depend on TemplatingBWC for Select2 usage

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**BC BREAK**: some of these changes could break existing apps. The user experience will also be
modified (we hope for the better).

* pep8 linting applied to code
* replaced older datagrids with newer declarative datagrids
* enabled sessions on grids, trap FK delete exception
* show only active users on Group form
* applying Select2 UI enhancement
* update dependencies, requires newer DataGridBWC version

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* **BC BREAK**: change <h2> primary headings to <h1>
* fix bad links in user permission map template (mlewellyn)
* adjust message on login page to reference authorized users

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* (MAJOR) fix bug that was causing groups to be deleted when a user is deleted. Make
sure that you run the fix-group-fk task to shore up the DB constraints.
* make User.testing_create() more robust
* fix bug in user permission map template that was causing exceptions if a user
was assigned to a group with permissions
* add console command to add administrative user